Lott, Richard W., author
Prentice-Hall, 1967
Buku Teks
Khan, Emdad H., author
Oxford & IBH Publishing, 1987
Buku Teks
O`Brien, James A., 1936-, author
Richard D. Irwin, 1986
Buku Teks
O`Brien, James A., 1936-, author
Richard D. Iriwin, 1986
Buku Referensi
Popkin, Gary S., author
Mifflin Company, 1981
Buku Teks