1. Berthaud, J. (1980), L’incompatibilité chez Coffea canephora méthode de test et détérminisme génétique. Café, Cacao, Thé 24: 267–274
2. Bettencourt, A.J. and Carvalho, A. (1968), Melhoramento do cafeeiro visando resistência à ferrugem. Bragantia, 27: 35–68
3. Bettencourt, A. J. (1973), Consideraçbes gerais sobre o Hfbrido do Timor. Campinas, Instituto Agronômico, Circ. n.° 23. 20 p.p.
4. Botstein, D.; White, R.L.; Skolnick, M. and Davis, R.W. (1980), Construction of a genetic linkage map in man using restriction fragment length polymorphisms. Am. J. Hum. Genet. 32: 314–321
5. Bridson, D. M. (1982), Studies in Coffea in Psilanthus (Rubiaceae subfam. Cinchonoideae) for part 2 of Flora of Tropical East Africa: Rubiaceae. Kew Bulletin 36 (4): 817–859