Gaya APA
Heyd, R, E, L, ;, B, H, E, ;, D, E.
(1991).
Finite mathematics
.
toronto:
D.C. Heath and Company.
Gaya MLA
Heyd, Roland, E., Larson, ;, Bruce, H., Edwards, ;, David, E..
"Finite mathematics".
toronto:
D.C. Heath and Company,
1991.
Text.