by Kibler, Robert J. [and others]
Allyn & Bacan , 1981
Buku Teks
Reilly, Dorothy E., author
Appleton-Century Crofts, 1978
Buku Teks
Mager, Robert F.
Fearon Publ., 1975
Buku Teks
Algie, Jimmy
kogan page, 1975
Buku Teks
Morris, Lynn Lyons, author
Sage , 1978
Buku Teks