London: Tiger Books International, 1994,
Buku Referensi
Peebles, Peyton Z., author
McGraw-Hill, 1980
Buku Teks
Adler, Robert J., author
John Wiley & Sons, 1981
Buku Teks
Springer, M.D., author
John Wiley & Sons, 1979
Buku Teks
Srivasan, S.K., author
Tata McGraw-Hill, 1981
Buku Teks