Last, John M., 1926-, author
Appleton & Lange, 1998
Buku Teks
Last, John M., 1926-, author
McGraw-Hill, 1997
Buku Teks
edited by Edwin D. Kilbourne, Wilson G. Smillie
MacMillan company, 1969
Buku Teks
edited by Moryteza Honari and Thomas Boleyn
Routledge, 1999
Buku Teks
Treshow, Michael, author
McGraw-Hill, 1976
Buku Teks