APA (7th ed.) Citation

Naciones Unidas (Nueva York). (1988). International codification system for medium and high rank coals. Naciones Unidas.

Chicago Style (17th ed.) Citation

Naciones Unidas (Nueva York). International Codification System for Medium and High Rank Coals. Nueva York: Naciones Unidas, 1988.

MLA (9th ed.) Citation

Naciones Unidas (Nueva York). International Codification System for Medium and High Rank Coals. Naciones Unidas, 1988.

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