Citazione Stile APA (7a Edizione)

Johnson, D. A. (1956). How to use field trips in mathematics. National Council of Teachers of Mathematics.

Citazione stile Chigago Style (17a edizione)

Johnson, Donovan A. How to Use Field Trips in Mathematics. Washington, D. C: National Council of Teachers of Mathematics, 1956.

Citatione MLA (9a ed.)

Johnson, Donovan A. How to Use Field Trips in Mathematics. National Council of Teachers of Mathematics, 1956.