APA (7th ed.) Citation

Dowling, J. W. F., Franco L., R., & Russell, R. B. C. (1982). Natural asphalts: Their occurrence, properties and use in road construction in Columbia. Transport and Road Research Laboratory.

Chicago Style (17th ed.) Citation

Dowling, J. W. F., Rudolfo Franco L., and R. B. C. Russell. Natural Asphalts: Their Occurrence, Properties and Use in Road Construction in Columbia. Crowthorne, Berkshire: Transport and Road Research Laboratory, 1982.

MLA (9th ed.) Citation

Dowling, J. W. F., et al. Natural Asphalts: Their Occurrence, Properties and Use in Road Construction in Columbia. Transport and Road Research Laboratory, 1982.