Johnson, D. A. (1956). How to use field trips in mathematics. National Council of Teachers of Mathematics.
Chicagoスタイル(17版)引用形式Johnson, Donovan A. How to Use Field Trips in Mathematics. Washington, D. C: National Council of Teachers of Mathematics, 1956.
MLA(9版)引用形式Johnson, Donovan A. How to Use Field Trips in Mathematics. National Council of Teachers of Mathematics, 1956.
警告: この引用は必ずしも正確ではありません.