You can cite sources as it is shown in the following:
For journals:
Example:
Sun CQ, O’Connor CJ, Roberton AM. Antibacterial actions of fatty acids and monoglycerides against Helicobacter pylori. FEMS Immunol Med Microbiol, (2003); 36:9-17. DOI: 10.1016/S0928-8244(03)00008-7
The DOI is important.
For books:
Example:
Wrobel KH. Male reproductive system. In: Dellmann H D. and Eurell JA. Textbook of Veterinary Histology, 5th ed. (eds.), Williams & Wilkins, Philadelphia,1998: 226–227. DOI or permanent link to the book website.
For more information, you can visit the Guide for Authors at https://qjvms.qu.edu.iq/journal/authors.note