Holt. Rinehart and Winston, 1974
Buku Teks
edited by Ronald Cohen and Elman R. Service
Institute for the Study of Human Issues, 1978
Buku Teks
Macmillan , 1980
Buku Teks
University of Pittsburgh Press, 1980
Buku Teks
Leininger, Madeleine M., author
John Wiley & Sons, 1978
Buku Teks