Berner, R. A. (1995). "AG Hogbom and the development of the concept of the geochemical carbon cycle". American Journal of Science. 295 (5): 491–495. Bibcode:1995AmJS..295..491B. doi:10.2475/ajs.295.5.491.
Berner, R. A. (1995). "AG Hogbom and the development of the concept of the geochemical carbon cycle". American Journal of Science. 295 (5): 491–495. Bibcode:1995AmJS..295..491B. doi:10.2475/ajs.295.5.491.