APA (7th ed.) Citation

Umbgrove, J. H. F. (1947). The pulse of the earth (2. ed.). Nijhoff.

Chicago Style (17th ed.) Citation

Umbgrove, Johannes Hermann Frederik. The Pulse of the Earth. 2. ed. The Hague: Nijhoff, 1947.

MLA (9th ed.) Citation

Umbgrove, Johannes Hermann Frederik. The Pulse of the Earth. 2. ed. Nijhoff, 1947.