Osborn, Anne G., 1943-
Utah : Amirsys, 2013
Buku Teks
Bird, Roger
Sweet & Maxwell, 1983
Buku Teks
edited by Leslie Rutherford
Sweet & Maxwell, 1993
Buku Referensi
Schermerhorn, John R., author
John Wiley & Sons, 1996
Buku Teks
Osborn, Richards C.
Harper & Brothers, 1959
Buku Teks