International Board for Plant Genetic Resources. (1987). Descriptor list for apple malus. IBPGR Secretariat.
Cita Chicago (17th ed.)International Board for Plant Genetic Resources. Descriptor List for Apple Malus. Roma: IBPGR Secretariat, 1987.
Cita MLA (9th ed.)International Board for Plant Genetic Resources. Descriptor List for Apple Malus. IBPGR Secretariat, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.