Most publishers have their own style guide that they require authors to use. No style is better than any other style even though they often handle citations and document formatting a little bit differently. Your instructor has chosen to use this style because it suits the type of document you are writing.
References cited in the text appear on the line, in square brackets, inside the punctuation. Grammatically, they may be treated as if they were footnote numbers or as nouns. NOTE: Use et al. when three or more names are given for a reference cited in the text.
as shown by Brown , ; as mentioned earlier , –, ; Smith  and Brown and Jones ; Wood et al. 
as demonstrated in ; according to  and –.
[#] F. M. Last,“Title of chapter in the book,” in Title of Book, xth ed. City of Publisher, (only U.S. State), Country: Abbrev. of Publisher, year, ch. x, sec. x, pp. xxx–xxx.
 B. Klaus and P. Horn, Robot Vision. Cambridge, MA, USA: MIT Press, 1986.
 L. Stein, “Random patterns,” in Computers and You, J. S. Brake, Ed. New York, NY, USA: Wiley, 1994, pp. 55–70.
[#] F. M. Last, “Name of paper,” Abbrev. Title of Periodical, vol. x, no. x, pp. xxx-xxx, Abbrev. Month, year, doi: xxx.
 M. M. Chiampi and L. L. Zilberti, “Induction of electric field in human bodies moving near MRI: An efficient BEM computational procedure,” IEEE Trans. Biomed. Eng., vol. 58, pp. 2787–2793, Oct. 2011, doi: 10.1109/TBME.2011.2158315.
[#] F. M. Last. (Date). Title. Presented at Abbreviated Conf. title. [Type of Medium]. Available: site/path/file
 V. Chandrasekaran, S. Sanghavi, P. A. Parrilo, and A. S. Willsky. (2009). Sparse and low-rank matrix decompositions. Presented at IFAC 2009. [Online]. Available: http://www.sciencedirect.com/science/ article/pii/S1474667016388632
[#] F. M. Last, “Title of report,” Company, City, State, Country, Rep. no., (optional: vol./issue), Date. Accessed: Date. [Online]. Available: site/path/file
 E. W. Miner and C. H. Lewis, “Hypersonic ionizing air viscous shock-layer flows over nonanalytic blunt bodies,” NASA, Blacksburg, VA, NASA CR-2550, May 1975. Accessed: Sep. 10, 2019. [Online]. Available: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750014556.pdf
Fig. 1. Semi truck with roof fairing .
 raymondclarkeimages, Sisbro. 2012. [Online]. Available: https://flic.kr/p/d4NJw7.
CC BY-NC 2.0.