Herren, Ray V.
The science of agriculture : a biological approach
Delmar Cengage Learning, 2012
 Buku Teks
Goodman, Arthur
"Precalculus: understanding fuctions, a graphing approach
Grove Brooks/Cole, 2000
 Buku Teks
Bodenheimer, Thomas S.
Understanding health policy : a clinical approach
Appleton & Lange, 1995
 Buku Teks
Eadie, Edward N., autohr
Understanding animal welfare: an integrated approach
[, Springer], 2012
 eBooks
Bryant, Peter, 1937-
Perception and understanding in young children : an experimental approach
Basic Books, 1974
 Buku Teks