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-Zitierstil (17. Ausg.)Dowling, J. W. F., Rudolfo Franco L., und 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-Zitierstil (9. Ausg.)Dowling, J. W. F., et al. Natural Asphalts: Their Occurrence, Properties and Use in Road Construction in Columbia. Transport and Road Research Laboratory, 1982.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.