Wilhide, Elizabeth, author
Conran Octopus, 1998
Buku Referensi
Peterson, Ralph
S & A Wheeler-Whitfield, 1972
Buku Teks
Laski, Harold J., author
Manchester University Press, 1951
Buku Teks
Asep M. Firmansyah, author
1996
UI - Skripsi (Membership)
Artikel Jurnal