Watt, William W. (William Whyte)
Holt, Rinehart and Winston, 1961
Koleksi Publik
edited by John L. Bradley and Martin Stevens
Rinehart and Winston, 1968
Buku Teks
Grebanier, Bernard D.N.
Henry Holt, 1959
Buku Teks
Schorer, Mark
Harcourt, Brace Jovanovich, 1972
Buku Teks
Macmillan, 1937, 1949
Buku Teks