APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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