Gaya APA
WILLERDING, M, F.
(1969).
ARITHMETIC: A FIRST COURSE IN MATHEMATICS
.
Boston:
Prindle, Weber, & Schmidt.
Gaya MLA
WILLERDING, Margaret, F..
"ARITHMETIC: A FIRST COURSE IN MATHEMATICS".
Boston:
Prindle, Weber, & Schmidt,
1969.
Textbook.