Gateways to democracy : an introduction to American government : the essentials
by John G. Geer [and others]
Wadsworth and Cengage Learning, 2012
 Buku Teks
Dell, J. A.
The gateways of knowledge : an introduction to the study of the senses
Univ. Press , 2013
 Buku Teks
Coon, Dennis
Introduction to psychology: gateways to mind and behavior
Wadsworth , 2001
 Buku Teks
Coon, Dennis
Introduction to psychology : gateways to mind and behavior
MA Cengage Learning, 2016
 Buku Teks
OConnor, Karen
American government
Addison Wesley Longman, 2001
 Buku Teks