Cribb, Phillip J.; Pollard, Benedict John (2004). "Bulbophyllum kupense P. J. Cribb & B. J. Pollard, an Unusual New Orchid from Western Cameroon". Kew Bulletin. 59 (1): 137–139. doi:10.2307/4111087. JSTOR4111087.
jstor.org
Cribb, Phillip J.; Pollard, Benedict John (2004). "Bulbophyllum kupense P. J. Cribb & B. J. Pollard, an Unusual New Orchid from Western Cameroon". Kew Bulletin. 59 (1): 137–139. doi:10.2307/4111087. JSTOR4111087.