Friedrich, Carl J., author
Ginn, 1950
Buku Teks
Friedrich, Carl J., author
Blaisdell, 1949
Buku Teks
Bernstein, Marver H.
Holt, Rinehart and Winston, 1960
Buku Teks
Carr, Robert K., author
Rinehart, 1957
Buku Teks
by Robert K. Carr ... [and others]
Holt, Rinehart and Winston, 1961
Buku Teks