Ebenstein, William, author
Holt, Rinehart and Winston, 1962
Buku Teks
Lipson, Leslie, author
Prentice-Hall, 1954
Buku Teks
Fowler, Robert Booth, author
Praeger, 1985
Buku Teks
Ebenstein, William, author
Rinehart, 1960
Buku Teks
Ebenstein, William, author
Thomson Learning, 2000
Buku Teks