Lee, Kathryn Dean, author
Appleton Century Crofts, 1949
Buku Teks
Wolf, Martin L., author
Philosophical Library, 1951
Buku Referensi
Willetts, William Y., author
Penguin Books , 1958
Buku Teks
Burling, Judith, author
Thames and Hudson, 1953
Buku Teks
Seiberling, Frank, author
A Holt-Dryden Book, 1959
Buku Teks