Alexander, Franz
The Falcon's Wing Press, 1956
Buku Teks
Ullmann, Leonard P., author
Prentice-Hall, 1975
Buku Teks
Sarason, Seymour B., author
Harper & Row , 1959
Buku Teks
Page, James Daniel, author
Tata McGraw-Hill, 1994
Buku Teks
Halgin, Richard P., author
Harcourt Brace Jovanovich College, 1993
Buku Teks