APA (7th ed.) Citation

Harland, W. B. (2003). Geological time scale (GTS98). PANGAEA.

Chicago Style (17th ed.) Citation

Harland, W B. Geological Time Scale (GTS98). PANGAEA, 2003.

MLA (9th ed.) Citation

Harland, W B. Geological Time Scale (GTS98). PANGAEA, 2003.

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