edited by Louis G. Locke, William M. Gibson, George Arm
Holt Rinehart and Winston, 1966
Buku Teks
Dean, Mitchell, 1955-
Routledge, 1991
Buku Teks
Severinghaus, Aura E., author
McGraw-Hill , 1953
Buku Teks
Holt, Rinehart and Winston, 1967
Buku Teks
Holt. Rinehart and Winston, 1974
Buku Teks