edited by Elizabeth M. Dowling, W. George Scarlett
Sage Publications, 2006
Buku Referensi
Basabe, Fernando M.
Sophia University, in cooperation with Charles E. Tuttle, 1968
Buku Teks SO
Kalam, A.P.J. Abdul
Ocean Books, 2005
Buku Teks SO
Durkheim, Emile
George Allen and Unwin, 1954
Buku Teks SO
edited by Simen Andersen Øyen, Tone Lund-Olsen and Nora Sørensen Vaage
Wageningen Academic, 2012
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