Page, G. Terry, author
New York, Kogan Page, 1977
Buku Referensi
YS. SS. Rahayuningsih HP, author
1985
UI - Skripsi (Membership)
Sykes, Egerton, author
London, J.M. Dent and Sons
Buku Referensi
Guinagh, Kevin, author
New York, The H.W. Wilson, 1965
Buku Referensi
Thomas, Joseph, author
Philadelphia : J.B. Lippincott, 1915
Buku Referensi