APA (7th ed.) Citation

Keesom, W. H. (1942). Helium. Elsevier.

Chicago Style (17th ed.) Citation

Keesom, Willem H. Helium. Amsterdam [u.a.]: Elsevier, 1942.

MLA (9th ed.) Citation

Keesom, Willem H. Helium. Elsevier, 1942.

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