Bratt, Elmer C., author
Richard D. Irwin, 1953
Buku Teks
Dauten, Carl Anton, 1913-, author
South-Western Publishing, 1978
Buku Teks
Valentine, Lloyd M., author
South-Western Publishing, 1991
Buku Teks
Bowers, David A., author
Addison-Wesley, 1985
Buku Teks
Hansen, Alvin Harvey, 1887-1975, author
W.W. Norton, 1951
Buku Teks