Bers, Lipman
Holt, Rinehart and winston, 1969
Buku Teks
Lange, Serge
Addison-Wesely, 1968
Buku Teks
Lightstone, A. H., author
Harper & Row, 1965
Buku Teks
Lightstone, A. H., author
Harper & Row, 1965
Buku Teks
Stein, Sherman K., author
McGraw-Hill, 1968
Buku Teks