Bremer R, Eriksson O (September 1992). "Evolution of fruit characters and dispersal modes in the tropical family Rubiaceae". Biological Journal of the Linnean Society. 47 (1): 79–95. doi:10.1111/j.1095-8312.1992.tb00657.x. ISSN0024-4066.
Evert RF, Eichhorn SE, Raven PH (2012-03-02). Raven Biology of plants (8th ed.). New York. ISBN9781429219617. OCLC781446671.{{cite book}}: CS1 maint: location missing publisher (link)
Evert RF, Eichhorn SE, Perry JB, Raven PH (2013). Laboratory topics in botany : to accompany Raven Biology of plants (8th ed.). New York, NY: W.H. Freeman and Co. ISBN9781464118104. OCLC820489734.
Bremer R, Eriksson O (September 1992). "Evolution of fruit characters and dispersal modes in the tropical family Rubiaceae". Biological Journal of the Linnean Society. 47 (1): 79–95. doi:10.1111/j.1095-8312.1992.tb00657.x. ISSN0024-4066.