Tohutoro APA (7th ed.)

Earth Works Group (Estados Unidos) & Earth Works Group. (1990). 50 simple things kids can do to save the earth. Andrews and McMeel.

Cita Chicago Style (17a ed.)

Earth Works Group (Estados Unidos) me Earth Works Group. 50 Simple Things Kids Can Do to Save the Earth. Kansas City: Andrews and McMeel, 1990.

Cita MLA (9a ed.)

Earth Works Group (Estados Unidos) me Earth Works Group. 50 Simple Things Kids Can Do to Save the Earth. Andrews and McMeel, 1990.