Cribb, Robert Bridson
NIAS Press, 2010
Multimedia
Djunaedi Muljawan ... [and others]
Deputi Pengembangan Kekayaan Alam, BPP Teknologi, 1997
Buku Referensi
Selmann, R. R.
Edward Arnold, 1953
Buku Referensi
Sellman, Roger Raymond
Edward Arnold, 1954
Buku Referensi
Hazard, Harry W.
Princeton University Press, 1951
Buku Referensi