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Nepi M, Soligo C, Nocentini D, Abate M, Guarnieri M, Cai G, Bini L, Puglia M, Bianchi L, Pacini E (2012). "Amino acids and protein profile in floral nectar: Much more than a simple reward". Flora. 207 (7): 475–481. Bibcode:2012FMDFE.207..475N. doi:10.1016/j.flora.2012.06.002.
Nassar J, Ramirez N, Linares O (1997). "Comparative pollination biology of Venezuelan columnar cacti and the role of nectar-feeding bats in their sexual reproduction". Am. J. Bot. 84 (7): 918–927. doi:10.2307/2446282. JSTOR2446282. PMID21708646.
Nassar J, Ramirez N, Linares O (1997). "Comparative pollination biology of Venezuelan columnar cacti and the role of nectar-feeding bats in their sexual reproduction". Am. J. Bot. 84 (7): 918–927. doi:10.2307/2446282. JSTOR2446282. PMID21708646.