Pusat Dokumentasi dan Informasi Ilmiah. Lembaga Ilmu Pengetahuan Indonesia, 2000
Buku Referensi
Collins, Lawrence, author
Butterworth, 1990
Buku Teks
London: Her Majesty's Stationary office, 1987,
Buku Referensi
Wiggins, Gary, 1943-, author
McGraw-Hill, 1991
Buku Teks
edited by C.P. Ager
Bowker-Saur, 1992
Buku Referensi