Plano, Jack C., author
Holt, Rinehart and Winston, 1985
Buku Referensi
Kenyon, John Samuel, author
Merriam-Webster ; G. & C. Merriam Co., 1953
Buku Referensi
Charles Scribner's Sons , 1981
Buku Referensi
Mellinkoff, David, author
[Publisher not identified], 1992
Buku Teks
edited by Robert Richards
Littlefield, Adams, 1955
Buku Referensi