1. Andersson, L. 1994. Ladenbergia. In: G. Harling & L. Andersson (eds.). Flora of Ecuador: Rubiaceae-Cinchoneae–Coptosapelteae 50: 16–33.
2. Andersson, L. 1995a. Tribes and genera of the Cinchoneae complex (Rubiaceae). Annals of the Missouri Botanical Garden 82: 409–427.
3. Andersson, L. 1995b. Diversity and origins of Andean Rubiaceae. Pp. 441–450. In: S. P. Churchill, H. Balslev, E. Forero, and J. L. Luteyn (eds.). Biodiversity and conservation of Neotropical montane forest. New York Botanical Garden.
4. Andersson, L. 1997. Synopsis of the genus Ladenbergia (Rubiaceae). Nordic Journal of Botany 17: 255–299.
5. Andersson, L. 1998. A revision of the genus Cinchona (Rubiaceae-Cinchoneae). Memoirs of the New York Botanical Garden 80: 1–75.