Mitchell, Jack N., author
Elsevier North Holland, 1978
Buku Teks
edited by Robert K. Merton
Free Press, 1979
Buku Teks
Neuman, William Lawrence, 1950-, author
Pearson, 2014
Buku Teks
Collins, Orvis, author
Mouton, 1973
Buku Teks
Bierens de Haan, Johan, 1892-, author
Pembangunan, 1960
Buku Teks