Spear, Percival, author
University of Michigan Press, 1961
Buku Teks
Smith, Wilfred C. (Wilfred Cantwell), author
The New American Library, 1957
Buku Teks
Selmann, R. R., author
Edward Arnold, 1953
Buku Referensi
Guerard, ALbert
Ann Arbor The University of Michigan 1959
Buku Teks
Cobban, Alfred, author
[publisher not identified], [date of publication no identified]
Buku Teks