Kopp, J. (1992). Frog math: Predict, ponder, play. Great Explorations in Math and Science (GEMS).
Citazione stile Chigago Style (17a edizione)Kopp, Jaine. Frog Math: Predict, Ponder, Play. Berkeley, CA: Great Explorations in Math and Science (GEMS), 1992.
Citatione MLA (9a ed.)Kopp, Jaine. Frog Math: Predict, Ponder, Play. Great Explorations in Math and Science (GEMS), 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.