Albert, Loy Morehead, editors
New American Library, 1972
Buku Referensi
David B. Guralnik, editor in chief
William Collins Publishers, 1976
Buku Referensi
Holt, Rinehard and Winston, Inc.
Holt, Rinehart and Winston,Inc, 1966
Buku Teks
edited by G. Elgie Christ
Frederick Warne and Co, 1960
Buku Referensi
editor, Alvina Treut Burrows
Holt, Rinehart and Winston, 1966
Buku Referensi