Duddy, Edward, author
Mcgraw-Hill, 1953
Buku Teks
Taylor, Weldon Johnson, 1908-, author
South-Western Publishing, 1975
Buku Teks
Carson, David, author
New York, John Wiley & Sons
Buku Teks
Alderson, Wroe, author
Richard D. Irwin, 1957
Buku Teks
McCarthy, E. Jerome, author
Irwin , 1978
Buku Teks