Gaya APA
Montessori, M. (2008).
Math 2: Negative Numbers And Pre-Algebra: Upper Elementary 9-12 .
America:
North American Montessori Center.
Gaya MLA
Montessori, Maria.
"Math 2: Negative Numbers And Pre-Algebra: Upper Elementary 9-12".
America:
North American Montessori Center,
2008.
Text.