APA Style
HECKENBACH, A, J. (1970).
ELEMENTARY FUNCTIONS AN APPROACH TO PRECALCULUS MATHEMATICS .
united states of america:
macmillan company.
MLA Style
HECKENBACH, ALAN, J..
"ELEMENTARY FUNCTIONS AN APPROACH TO PRECALCULUS MATHEMATICS".
united states of america:
macmillan company,
1970.
Text.