Vazsonyi, Andrew, author
Richard D. Irwin, 1980
Buku Teks
Potter, George B., author
Business, 1984
Buku Teks
Long, Larry E., author
Reston Publishing, 1979
Buku Teks
Orilia, Lawrence S., author
McGraw-Hill, 1982
Buku Teks
Slotnick, Daniel L., author
D.C. Health, 1986
Buku Teks