Levin, Murray B.
Rinehart and Winston, 1960
Buku Teks
Levin, Murray B.
The Bobb-Merrill, 1962
Buku Teks
Aristotles, author
Modern Library, 1943
Buku Teks
Soltau, Roger H.
Longmans, Green , 1951
Buku Teks
Soltau, Roger H.
Longmans, Green , 1960
Buku Teks