Citazione Stile APA (7a Edizione)

Greenes, C. E., & Findell, C. R. (1999). Groundworks: Algebraic thinking, grade 1, [teacher book]. Creative Publications.

Citazione stile Chigago Style (17a edizione)

Greenes, Carole E., e Carol R. Findell. Groundworks: Algebraic Thinking, Grade 1, [teacher Book]. Chicago (Ill.): Creative Publications, 1999.

Citatione MLA (9a ed.)

Greenes, Carole E., e Carol R. Findell. Groundworks: Algebraic Thinking, Grade 1, [teacher Book]. Creative Publications, 1999.