The style is either built in or you can download a CSL file that is supported by most references management programs.
BibTeX syles are usually part of a LaTeX template. Check the instructions to authors if the publisher offers a LaTeX template for this journal.
Those examples are references to articles in scholarly journals and how they are supposed to appear in your bibliography.
Not all journals organize their published articles in volumes and issues, so these fields are optional. Some electronic journals do not provide a page range, but instead list an article identifier. In a case like this it's safe to use the article identifier instead of the page range.
A journal article with 1 author
1. Quirk T. Writers should not fear jargon. Nature. 2012;487:407.
A journal article with 2 authors
1. Roediger HL 3rd, DeSoto KA. Cognitive psychology. Forgetting the presidents. Science. 2014;346:1106–9.
A journal article with 3 authors
1. Sørensen TL-M, Møller JV, Nissen P. Phosphoryl transfer and calcium ion occlusion in the calcium pump. Science. 2004;304:1672–5.
A journal article with 7 or more authors
1. Wu H-C, Mryasov ON, Abid M, Radican K, Shvets IV. Magnetization states of all-oxide spin valves controlled by charge-orbital ordering of coupled ferromagnets. Sci Rep. 2013;3:1830.
Books and book chapters
Here are examples of references for authored and edited books as well as book chapters.
An authored book
1. Seyfried TN. Cancer as a Metabolic Disease. Hoboken, NJ: John Wiley & Sons, Inc.; 2012.
1. Chand AN, Yuta S. Field Trial Results of Autonomous Road Crossing Mobile Robot. In: Lee S, Cho H, Yoon K-J, Lee J, editors. Intelligent Autonomous Systems 12: Volume 1 Proceedings of the 12th International Conference IAS-12, held June 26-29, 2012, Jeju Island, Korea. Berlin, Heidelberg: Springer; 2013. p. 57–66.
This example shows the general structure used for government reports, technical reports, and scientific reports. If you can't locate the report number then it might be better to cite the report as a book. For reports it is usually not individual people that are credited as authors, but a governmental department or agency like "U. S. Food and Drug Administration" or "National Cancer Institute".
1. Government Accountability Office. Summary of Improvement Actions Taken by the Government Printing Office in the Utilization and Management of Automatic Data Processing Resources. Washington, DC: U.S. Government Printing Office; 1976 May. Report No.: FGMSD-76-58.
Theses and dissertations
Theses including Ph.D. dissertations, Master's theses or Bachelor theses follow the basic format outlined below.
1. Bergh PA. Reconfiguring academic priorities: Through the eyes of Michigan community college Chief Academic Officers [Doctoral dissertation]. [Phoenix, AZ]: University of Phoenix; 2009.
News paper articles
Unlike scholarly journals, news papers do not usually have a volume and issue number. Instead, the full date and page number is required for a correct reference.
New York Times article
1. Billard M. For the Fierce Of Foot. New York Times. 2010 Sep 16;E7.
References should be cited in the text by sequential numbers in square brackets:
This sentence cites one reference . This sentence cites two references [1,2]. This sentence cites four references [1–4].