Hagan, John
McGraw-Hill Ryerson , 1977
Buku Teks
Stebbins, Robert A.
Greenwood Pub. Corp , 1971
Buku Teks
Adler, Patricia A., author
Wadsworth, 2000
Buku Teks
edited by Henry N. Pontell
Pearson Education, 2005
Buku Teks
Suchar, Charles S.
Holt, Rinehart and Winston, 1978
Buku Teks