The correct format for referencing the study guide in the reference list of your assessments, according to standard referencing practices, is usually option 4:
4.
Swanepoel, N. and Bruwer, C. 2016. Archaeological fieldwork techniques and analytical methods. Pretoria: Unisa.
This option includes the authors' names, the year of publication, the title of the work in italics, the place of publication, and the publisher, which aligns with common