| Author | Title | Journal/publisher | Literature ref. no. |
| Beard, J.S. (1992) | The Proteas of Tropical Africa | Kangaroo Press | 985 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.
| Species found: 3 |
| Protea petiolaris subsp. petiolaris |
| Protea rupestris |
| Protea welwitschii |