Kelley, Walter G.
Difference equations : an introduction with applications
Academic Press, 1991
 Buku Teks SO
The student and the learning environment
edited by Susan S. Meihofer
National Education Association , 1974
 Buku Teks
Huddleston, Rodney
A Student's introduction to English grammar
Cambridge University Press, 2006
 Buku Teks
Critical thinking : student's introduction
by Gregory Bassham [and others]
McGraw-Hill, 2013
 Buku Teks
Brown, George
Assessing student learning in higher education
Routledge, 1997
 Buku Teks