The references should specify the source (such as
book, journal article or a web page) in sufficient detail to enable the
readers to identify and consult it. The references are placed at the end
of the work, with sources listed alphabetically (a) by authors' surnames
or (b) by the titles of the sources (if the author is unknown). Multiple
entries by the same author(s) must be sequenced chronologically, starting
from the earliest, e.g.:
Ljubojević, T.K. (1998).
Ljubojević, T.K. (2000a).
Ljubojević, T.K. (2000b).
Ljubojević, T.K., & Dimitrijević, N.N. (1994).
Here is a list of the most common reference types: