Exton, Harold, author
Ellis Horwood, 1978
Buku Referensi
Exton, Harold
Chichester Ellis Horwood, 1976
Buku Teks
Ernst Thomas
[Ernst Thomas , ], 2012
eBooks
edited by Milton Abramowitz, Irene A. Stegun
U.S. Government Printing Office, 1967
Buku Referensi
Siddiqi, A.H.
Tata McGraw-Hill , 1992
Buku Teks