Gaya APA
Underhill, Bob. (1981).
Teaching elementary school mathematics (3rd ed).
Columbus:
Charles E. Merrill.
Gaya Chicago
Underhill, Bob.
Teaching elementary school mathematics.
3rd ed
Columbus:
Charles E. Merrill,
1981.
Text.
Gaya MLA
Underhill, Bob.
Teaching elementary school mathematics.
3rd ed
Columbus:
Charles E. Merrill,
1981.
Text.
Gaya Turabian
Underhill, Bob.
Teaching elementary school mathematics.
3rd ed
Columbus:
Charles E. Merrill,
1981.
Print.