Liebhafsky, H.H., author
Dorsey Press, 1965
Buku Teks
Allen, Clark Lee, author
Wadsworth, 1962
Buku Teks
Allen, Clark Lee, author
Wadsworth, 1962
Buku Teks
Friedman, David D., author
South-Western Publishing, 1986
Buku Teks
Pashigian, B. Peter, author
McGraw-Hill, 1998
Buku Teks