APA (7th ed.) Citation

龚勋主编. (2015). 外星人与UFO. 宁夏人民.

Chicago Style (17th ed.) Citation

龚勋主编. 外星人与UFO. 宁夏人民, 2015.

MLA (8th ed.) Citation

龚勋主编. 外星人与UFO. 宁夏人民, 2015.

Warning: These citations may not always be 100% accurate.