Gaya APA
Elwell, F, W. (2013).
Sociocultural Systems: Principles of Structure and Change .
Canada:
AU Press, Athabasca University.
Gaya MLA
Elwell, Frank, W..
"Sociocultural Systems: Principles of Structure and Change".
Canada:
AU Press, Athabasca University,
2013.
e-book.