APA (7th ed.) Citation

Lassen, K. (1997). Twentieth century retreat of sea-ice in the Greenland sea: Knud Lassen. Danish Meteorological Institute.

Chicago Style (17th ed.) Citation

Lassen, Knud. Twentieth Century Retreat of Sea-ice in the Greenland Sea: Knud Lassen. Copenhagen: Danish Meteorological Institute, 1997.

MLA (9th ed.) Citation

Lassen, Knud. Twentieth Century Retreat of Sea-ice in the Greenland Sea: Knud Lassen. Danish Meteorological Institute, 1997.

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