Agave sobria Brandegee
| Expeditions of the California Academy of Sciences to the Gulf of California in 1921. The botany (the vascular plants) Ivan Murray Johnston (1924) Proceedings of the California Academy of Sciences 12: 951-1218 | |
| The stomatal complex in Agave: groups Deserticolae, Campaniflorae, Umbelliflorae Howard Scott Gentry and Jane R Sauck (1978) Proceedings of the California Academy of Sciences 41: 371-387 |