Olszewski, Pawel; Wirth, Michelle; Shaw, Timothy; Grace, Martha; Levine, Allen (February 20, 2003). "Peptides that Regulate Food Intake Effect of peptide histidine isoleucine on consummatory behavior in rats". American Journal of Physiology. Regulatory, Integrative and Comparative Physiology. 284 (6): R1445 –R1453. doi:10.1152/ajpregu.00554.2002. PMID12595279.
Kulick R, Chaiseha Y, Kang S, Rozenboim I, El Halawani M (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): 267–273. doi:10.1016/j.ygcen.2004.12.024. PMID15935152.
Olszewski, Pawel; Wirth, Michelle; Shaw, Timothy; Grace, Martha; Levine, Allen (February 20, 2003). "Peptides that Regulate Food Intake Effect of peptide histidine isoleucine on consummatory behavior in rats". American Journal of Physiology. Regulatory, Integrative and Comparative Physiology. 284 (6): R1445 –R1453. doi:10.1152/ajpregu.00554.2002. PMID12595279.
Kulick R, Chaiseha Y, Kang S, Rozenboim I, El Halawani M (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): 267–273. doi:10.1016/j.ygcen.2004.12.024. PMID15935152.