Gordon, Robert Aaron, author
Harper & Brothers, 1952
Buku Teks
Dauten, Carl Anton, 1913-, author
South-Western Publishing, 1978
Buku Teks
Valentine, Lloyd M., author
South-Western Publishing, 1991
Buku Teks
Chambers, Edward J., author
Prentice-Hall, 1961
Buku Teks
Maisal, Sherman J., author
John Wiley & Sons, 1957
Buku Teks