APA (7th ed.) Citation

Koefoed, O. (1979). Geosounding principles Otto Koefoed. Elsevier.

Chicago Style (17th ed.) Citation

Koefoed, Otto. Geosounding Principles Otto Koefoed. Amsterdam ; Oxford (etc.): Elsevier, 1979.

MLA (9th ed.) Citation

Koefoed, Otto. Geosounding Principles Otto Koefoed. Elsevier, 1979.

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