Gaya APA

Posamentier, A, S., Stepelman, J. (1990). Teaching secondary school mathematics : techniques and enrichment units (3rd.ed.). Columbus: Merrill Publishing.

Gaya MLA

Posamentier, Alfred, S.., Stepelman, Jay. "Teaching secondary school mathematics : techniques and enrichment units". 3rd.ed. Columbus: Merrill Publishing, 1990. Text.