Cronquist, A.J. (1981), An Integrated System of Classification of Flowering Plants: 1-14 [secondary reference]

Reveal, J.L. (29 April 1996), Newly Required Suprageneric Names in Vascular Plants. Phytologia 79(2): 70 [tax. nov.]

Takhtajan, A.L. (1997), Diversity and Classification of Flowering Plants: 20-24 [secondary reference]

---