Farrell, M. A., & Farmer, W. A. (1980). Systematic instruction in mathematics for the middle and high school years. Addison-Wesley Publishing Company.
Citazione stile Chigago Style (17a edizione)Farrell, Margaret A., e Walter A. Farmer. Systematic Instruction in Mathematics for the Middle and High School Years. Reading [etc.]: Addison-Wesley Publishing Company, 1980.
Citatione MLA (9a ed.)Farrell, Margaret A., e Walter A. Farmer. Systematic Instruction in Mathematics for the Middle and High School Years. Addison-Wesley Publishing Company, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.