Bowen R (1999-01-24). "Vasoactive Intestinal Peptide". Pathophysiology of the Endocrine System: Gastrointestinal Hormones. Colorado State University. Arquivado dende o orixinal o 04 de febreiro de 2012. Consultado o 2009-02-06.
Kulick RS, Chaiseha Y, Kang SW, Rozenboim I, El Halawani ME (2005). "The relative importance of vasoactive intestinal peptide and peptide histidine isoleucine as physiological regulators of prolactin in the domestic turkey". Gen. Comp. Endocrinol.142 (3): 267–73. PMID15935152. doi:10.1016/j.ygcen.2004.12.024.
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Kulick RS, Chaiseha Y, Kang SW, Rozenboim I, El Halawani ME (2005). "The relative importance of vasoactive intestinal peptide and peptide histidine isoleucine as physiological regulators of prolactin in the domestic turkey". Gen. Comp. Endocrinol.142 (3): 267–73. PMID15935152. doi:10.1016/j.ygcen.2004.12.024.
Bowen R (1999-01-24). "Vasoactive Intestinal Peptide". Pathophysiology of the Endocrine System: Gastrointestinal Hormones. Colorado State University. Arquivado dende o orixinal o 04 de febreiro de 2012. Consultado o 2009-02-06.