Earth Works Group (Estados Unidos) & Earth Works Group. (1990). 50 simple things kids can do to save the earth. Andrews and McMeel.
Style de citation Chicago (17e éd.)Earth Works Group (Estados Unidos) et Earth Works Group. 50 Simple Things Kids Can Do to Save the Earth. Kansas City: Andrews and McMeel, 1990.
Style de citation MLA (9e éd.)Earth Works Group (Estados Unidos) et Earth Works Group. 50 Simple Things Kids Can Do to Save the Earth. Andrews and McMeel, 1990.
Attention : ces citations peuvent ne pas être correctes à 100%.