In text citations should follow the author-date method whereby the author's last name and the year of publication for the source should appear in the text, for example, (Jones, 1998). Articles with one or two authors (Bogin & Rios, 2003) include all names in every in-text citation; articles with three, four, or more authors are abbreviated to the first author name plus et al. The complete reference list should appear alphabetically by name at the end of the paper. Reference should be cited according to NLM citation style. A full documentation is given in the The NLM Style Guide for Authors. Adding doi number is desirable. If the number of authors exceeds six, the first six authors are mentioned, the remaining authors are abbreviated to et al.

Journal article
Hermanussen M, Scheffler C, Groth D, AƟmann C. Height and skeletal morphology in relation to modern life style. J Physiol Anthropol. 2015;34:41. doi: 10.1186/s40101-015-0080-4.

Book Edition
Eveleth PB, Tanner JM. Worldwide variation in human growth. 2nd ed. Cambridge University Press; Cambridge; UK; 1990. 250 p.