Precalculus and discrete mathematics : chapters 10-14
by Anthony L. Peressini [and others]
The University of Chicago, 1989
 Buku Teks
Wheeler, Ruric E.
Modern mathematics an elementary approach
Brook/Cole, 1969
 Buku Teks SO
Wheeler, Ruric E.
Modern mathematics: an elementary approach
Brooks/Cole, 1967
 Buku Teks SO
Wheeler, Ruric E.
Modern mathematics : an elementary approach
Brooks/Cole, 1970
 Buku Teks SO
Willson, Jack D.
Elementary mathematics a modern approach / Jack D. Willson
McGraw-Hill , 1967
 Buku Teks SO