Gaskell, D.C., author
Longman Group, 1973
Buku Teks
Tsoulfanidis, Nicholas
Hemisphere Publishing Co. , 1983
Buku Teks
Kicthen, Ronald, author
Oxford : Newnes, 2003
Buku Referensi
White, J.E., author
McGraw-Hill, 1965
Buku Teks
Gumay Khotibul Umam, author
2015
UI - Skripsi (Membership)