Gaya APA

Krulik, S., Posamentier, A, S. (2012). The Art of Motivating Students: For Mathematics Instruction . New York, America: McGraw-Hill.

Gaya MLA

Krulik, Stephen., Posamentier, Alfred, S.. "The Art of Motivating Students: For Mathematics Instruction". New York, America: McGraw-Hill, 2012. Text.