Johnson, D. A. (1956). How to use field trips in mathematics. National Council of Teachers of Mathematics.
Citação norma ChicagoJohnson, Donovan A. How to Use Field Trips in Mathematics. Washington, D. C: National Council of Teachers of Mathematics, 1956.
Citação norma MLAJohnson, Donovan A. How to Use Field Trips in Mathematics. National Council of Teachers of Mathematics, 1956.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.