For Ehretiaceae
Al-Shehbaz, I.A. 1991. The genera of Boraginaceae in the southeastern United States. J. Arnold Arb. Suppl. Series 1: 1-169.
Gottschling, M., F. Luebert, H.H. Hilger, and J.S. Miller. 2014. Molecular delimitations in the Ehretiaceae (Boraginales). Molec. Phylogenetics and Evol. 72: 1-6.
Gottschling, Weigend, & Hilger. 2016. In Kadereit, J.W., and V. Bittrich. 2016. The families and genera of flowering plants. XIV. Flowering plants – Eudicots – Aquifoliales, Boraginales, Bruniales, Dipsacales, Escalloniales, Garryales, Paracryphiales, Solanales (except Convolvulaceae), Icacinaceae, Metteniusaceae, Vahliaceae. Springer, Berlin. 412 pp.
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