edited by Don W. Stack, Michael B. Salwen
Routledge, Taylor & Francis Group, 2009
Buku Teks
Osborn, Richard N., author
John Wiley & Sons, 1980
Buku Teks
Furlong, Nancy E., author
Harcourt College Publishers, 2000
Buku Teks
Fredric M. Jablin, Linda L. Putnam
Sage Publications, 2001
Buku Teks
Ross, Alan O., author
McGraw-Hill, 1974
Buku Teks