Cooper, William D. (William David), author
Reston Publishing, 1982
Buku Teks
Ferre, John P., author
Charles E. Merrill Pub. Co., 1983
Buku Referensi
Pollack, Merrill
Bobbs-Merrill, 1962
Buku Teks
George Routledge and Sons, 1969
Buku Referensi
George Routledge and Sons, 1969
Buku Referensi