Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Makalah dan Kertas Kerja
edited by James Hastings
New York Charles Scribner's Sons 1961
Buku Referensi
Butterworth-Heinemann, 2013
eBooks
Smith, Preserved, author
Collier Books, 1962
Buku Teks
Saxena, Subhash Chandra
Prentice Hall of India, 1980
Buku Teks