Cita APA (7a ed.)
Gibbons, D. J., Gray, T. L., Horvath, E. K., & Nash, M. The Land of Open Sky: Southwest USA. National Geographic Society.
Cita estilo Chicago (17a ed.)
Gibbons, Debbie J., Thomas L. Gray, Etelka K. Horvath, y Marie Nash. The Land of Open Sky: Southwest USA. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Gibbons, Debbie J., et al. The Land of Open Sky: Southwest USA. National Geographic Society.
警告：這些引文格式不一定是100％准確.