龚勋 & 李萍. (2009). 国家地理百科全书: China national geography. 云南教育出版社.
Chicago Style (17th ed.) Citation龚勋 and 李萍. 国家地理百科全书: China National Geography. 云南教育出版社, 2009.
MLA (8th ed.) Citation龚勋 and 李萍. 国家地理百科全书: China National Geography. 云南教育出版社, 2009.
Warning: These citations may not always be 100% accurate.