APA Citation

Langley, A., & Langley, A. (1990). 20 exploradores. Bogotá, Colombia: Norma.

Chicago Style Citation

Langley, Andrew, and Andrew Langley. 20 Exploradores. Bogotá, Colombia: Norma, 1990.

MLA Citation

Langley, Andrew, and Andrew Langley. 20 Exploradores. Bogotá, Colombia: Norma, 1990.

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