Aguirre, Adalberto, author
McGraw-Hill, Higher Education, 2009
Buku Teks
Aguirre, Adalberto, author
McGraw-Hill, 2001
Buku Teks
Simpson, George Eaton, 1904-, author
Harper & Brothers, 1958
Buku Teks
Hill, Lance, author
The University of North Carolina Press, 2004
Buku Teks
Padelford, Norman J., author
Macmillan, 1962
Buku Teks