APA (7th ed.) Citation

Pennings, N. H. (1976). The Leiden dilution refrigerator.

Chicago Style (17th ed.) Citation

Pennings, Nicolaas H. The Leiden Dilution Refrigerator. 1976.

MLA (9th ed.) Citation

Pennings, Nicolaas H. The Leiden Dilution Refrigerator. 1976.

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