by P. Doyle [and others]
Harper & Row, c1974
Buku Teks
Fitzroy, Peter T.
McGraw-Hill, 1976
Buku Teks
Prentice-Hall, [date of publication not identified]
Buku Teks
Harper & Row, 1974
Buku Teks
Taylor, Weldon Johnson, 1908-, author
South-Western Publishing, 1975
Buku Teks