Whitehouse, David J.
Philadelphia : IOP, 2003,
Buku Referensi
Whitehouse, David J., author
IOP , 2003
Buku Referensi
edited by Syney G. Davidson
Pergamon Press, 1981
Buku Teks
Lowell, S., author
Chapman and Hall, 1984
Buku Teks
Universitas Indonesia, 2003
UI - Skripsi (Membership)