Cita APA (7a ed.)

Geography Education Standards Project (Estados Unidos). (1994). Geography for life: National geography standards 1994. National Geographic Research & Exploration.

Cita Chicago Style (17a ed.)

Geography Education Standards Project (Estados Unidos). Geography for Life: National Geography Standards 1994. Washington, D.C.: National Geographic Research & Exploration, 1994.

Cita MLA (9a ed.)

Geography Education Standards Project (Estados Unidos). Geography for Life: National Geography Standards 1994. National Geographic Research & Exploration, 1994.