Linneman, Thomas J., author
Routledge, 2018
Buku Teks
Healey, Joseph F., 1945-, author
Wadsworth and Cengage Learning, 2012
Buku Teks
by Claire Selltiz [and others]
Holt, Rinehart and Winston, 1959
Buku Teks
Orenstein, Alan
The Falmer Press, 1978
Buku Teks
Goode, William J., author
McGraw-Hill, 1952
Buku Teks