Sibley, Charles Gald, author
Yale University Press, 1991
Buku Teks
edited by Stanley Cramp, C.M. Perrins
Oxford University Press, 1993
Buku Referensi
Peterson, Roger Tory, author
Houghton Miffiln, 1980
Buku Referensi
Savina, author
1989
UI - Skripsi (Membership)
North, Alfred J.
Oxford University Press, 1984
Buku Referensi