Barnhart, Clarence L., author
Random House, 1951
Buku Referensi
The World Publishing Co., 1960
Buku Referensi
edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
John C. Winston, 1942
Buku Referensi
Walters, Morgan L
N.Y.Holt Rinehart and Winston,inc, 1966
Buku Teks
edited by Jess Stein
Dell Publishing, 1962
Buku Referensi