Gaya APA
OPIE, B. (1995).
ADDITION, SUBTRACTION, PLACE VALUE, AND OTHER NUMERATION SYSTEMS .
Amerika:
INCENTIVE PUBLICATIONS.
Gaya MLA
OPIE, BRENDA.
"ADDITION, SUBTRACTION, PLACE VALUE, AND OTHER NUMERATION SYSTEMS".
Amerika:
INCENTIVE PUBLICATIONS,
1995.
Text.