(2020, January 23). permafrost A Dictionary of Construction, Surveying, and Civil Engineering.
Chicago Style (17th ed.) Citation"Permafrost." A Dictionary of Construction, Surveying, and Civil Engineering 23 Jan. 2020.
MLA (9th ed.) Citation"Permafrost." A Dictionary of Construction, Surveying, and Civil Engineering, 23 Jan. 2020.
Warning: These citations may not always be 100% accurate.