Dean, Mitchell, 1955-
Routledge, 1991
Buku Teks
Severinghaus, Aura E.
McGraw-Hill , 1953
Buku Teks
edited by Louis G. Locke, William M. Gibson and George W. Arms
Holt, Rinehart and Winston, 1967
Buku Teks
edited by George Dearborn Spindler
Holt, Rinehart and Winston, 1974
Buku Teks
Snedden, Billy Mackie
Macmillan, 1990
Buku Teks SO