Johansson, J. T. (1992). Pollen morphology in Psychotria (Rubiaceae, Rubioideae, Psychotrieae) and its taxonomic significance: A preliminary survey. Council for Nordic Publ. in Botany.
Chicago-Zitierstil (17. Ausg.)Johansson, Jan T. Pollen Morphology in Psychotria (Rubiaceae, Rubioideae, Psychotrieae) and Its Taxonomic Significance: A Preliminary Survey. Copenhagen: Council for Nordic Publ. in Botany, 1992.
MLA-Zitierstil (9. Ausg.)Johansson, Jan T. Pollen Morphology in Psychotria (Rubiaceae, Rubioideae, Psychotrieae) and Its Taxonomic Significance: A Preliminary Survey. Council for Nordic Publ. in Botany, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.