Matz, Adolph, author
Ohio South-Western Publishing , 1967/1991
Buku Teks
Hansen, Don R., author
South-Western College, 2000
Buku Teks
Hansen, Don R., author
South-Western College Publishing, 1997
Buku Teks
Hansen, Don R., author
South-Western College Publishing, 1997
Buku Teks
Usry, Milton F., author
South Western, 1988
Buku Teks
Gillespie, Cecil, author
Prentice-Hall, 1957
Buku Teks