Gross, Bertram M., author
Collier-Macmillan, 1968
Buku Teks
Rainey, Hal G., author
John Wiley & Sons, 2003
Buku Teks
Gross, Bertram M., author
Free Press of Glencoe, 1964
Buku Teks
Gross, Bertram M., author
Free Press of Glencoe, 1964
Buku Teks
Steers, Richard M., author
Kent Publishing, 1985
Buku Teks