G & C Merriam Co., 1947
Buku Referensi
G & C Merriam Co., 1951
Buku Referensi
Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Victoria Neufeldt, Andrew N. Sparks, editor
Simon & Schuster, 1989
Buku Referensi