APA (7th ed.) Citation

Crawford, C. B., & Johnston, G. H. (1971). Construction on permafrost.

Chicago Style (17th ed.) Citation

Crawford, C. B., and G. H. Johnston. Construction on Permafrost. 1971.

MLA (9th ed.) Citation

Crawford, C. B., and G. H. Johnston. Construction on Permafrost. 1971.

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