APA (7th ed.) Citation

Grabau, A. W. (1922). Ordovician fossils of north China. Geological Survey of China.

Chicago Style (17th ed.) Citation

Grabau, Amadeus W. Ordovician Fossils of North China. Peking: Geological Survey of China, 1922.

MLA (8th ed.) Citation

Grabau, Amadeus W. Ordovician Fossils of North China. Geological Survey of China, 1922.