APA Citation

Umbgrove, J. H. F. (1947). The Pulse of the earth. Holland:The Haque Martinus Nijhoff.

Chicago Style Citation

Umbgrove, J. H. F. The Pulse of the Earth. Holland:The Haque Martinus Nijhoff, 1947.

MLA Citation

Umbgrove, J. H. F. The Pulse of the Earth. Holland:The Haque Martinus Nijhoff, 1947.

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