For Diodia
Bacigalupo, N.M., and E.L. Cabral. 1999. Revisión de las especies americanas del género Diodia (Rubiaceae, Spermacoceae). Darwiniana 37: 153-165.
Rogers, G.K. 2005. The genera of Rubiaceae in the southeastern United States, part II. Subfamily Rubioideae, and subfamily Cinchonoideae revisited (Chiococca, Erithalis, and Guettarda). Harvard Papers in Botany 10: 1-45.
Sorrie, B.A. 2016a. Reinstatement of Diodia harperi (Rubiaceae), a southeastern USA Coastal Plain endemic. Phytoneuron 2016-3: 1-13. Published 7 January 2016. ISSN 2153 733X
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