edited by Stanley Johnson
John Wiley & Sons, 1973
Buku Teks
Wrong, Dennis H
Random House, 1985
Buku Teks
edited by William Petersen
Macmillan, 1972
Buku Teks
Thompson, Warren S., author
McGraw-Hill, 1970
Buku Teks
Smith, T. Lynn
J. B. Lippincott Company, 1960
Buku Teks