Gould, John P., author
Richard D. Irwin Inc., c1980
Buku Teks
Ferguson, C.E., author
Irwin, 1975
Buku Teks
Ferguson, C.E., author
Richard D. Irwin, 1966
Buku Teks
McCloskey, Donald N., author
Macmillan, 1985
Buku Teks
Salvatore, Dominick, author
McGraw-Hill, 1983
Buku Teks