Toulmin, Stephen
The University of Chicago Press, 1999
Buku Teks
Baker, Robert H., author
D. Van Nostrand, 1964
Buku Teks
Chapman, Robert D., author
W.H. Freeman, 1978
Buku Teks
Jefferys, William H., author
John Wiley & Sons, 1981
Buku Teks
Hoyle, Fred, author
Harper & Brothers, 1955
Buku Teks