Tuma, Jan J., author
McGraw-Hill, 1979
Buku Referensi
edited by Milton Abramowitz, Irene A. Stegun
U.S. Government Printing Office, 1967
Buku Referensi
Keenan, Joseph H.
John Wiley & Sons, 1980
Buku Teks
Tuma, Jan J., author
McGraw-Hill, 1975
Buku Teks
Exton, Harold, author
Ellis Horwood, 1978
Buku Referensi