APA (7th ed.) Citation

Croll, J. (2004). An alternative model for pingo formation in permafrost regions.

Chicago Style (17th ed.) Citation

Croll, JGA. An Alternative Model for Pingo Formation in Permafrost Regions. 2004.

MLA (9th ed.) Citation

Croll, JGA. An Alternative Model for Pingo Formation in Permafrost Regions. 2004.

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