Tatemoto K, Hosoya M, Habata Y, Fujii R, Kakegawa T, Zou MX, Kawamata Y, Fukusumi S, Hinuma S, Kitada C, Kurokawa T, Onda H, Fujino M (1998). „Isolation and characterization of a novel endogenous peptide ligand for the human APJ receptor”. Biochem. Biophys. Res. Commun.251 (2): 471–6. DOI:10.1006/bbrc.1998.9489. PMID9792798.
Lee DK, Cheng R, Nguyen T, Fan T, Kariyawasam AP, Liu Y, Osmond DH, George SR, O'Dowd BF (2000). „Characterization of apelin, the ligand for the APJ receptor”. J. Neurochem.74 (1): 34–41. DOI:10.1046/j.1471-4159.2000.0740034.x. PMID10617103.
Szokodi I, Tavi P, Földes G, Voutilainen-Myllylä S, Ilves M, Tokola H, Pikkarainen S, Piuhola J, Rysä J, Tóth M, Ruskoaho H (2002). „Apelin, the novel endogenous ligand of the orphan receptor APJ, regulates cardiac contractility”. Circ. Res.91 (5): 434–40. DOI:10.1161/01.RES.0000033522.37861.69. PMID12215493.
Tatemoto K, Hosoya M, Habata Y, Fujii R, Kakegawa T, Zou MX, Kawamata Y, Fukusumi S, Hinuma S, Kitada C, Kurokawa T, Onda H, Fujino M (1998). „Isolation and characterization of a novel endogenous peptide ligand for the human APJ receptor”. Biochem. Biophys. Res. Commun.251 (2): 471–6. DOI:10.1006/bbrc.1998.9489. PMID9792798.
Lee DK, Cheng R, Nguyen T, Fan T, Kariyawasam AP, Liu Y, Osmond DH, George SR, O'Dowd BF (2000). „Characterization of apelin, the ligand for the APJ receptor”. J. Neurochem.74 (1): 34–41. DOI:10.1046/j.1471-4159.2000.0740034.x. PMID10617103.
Szokodi I, Tavi P, Földes G, Voutilainen-Myllylä S, Ilves M, Tokola H, Pikkarainen S, Piuhola J, Rysä J, Tóth M, Ruskoaho H (2002). „Apelin, the novel endogenous ligand of the orphan receptor APJ, regulates cardiac contractility”. Circ. Res.91 (5): 434–40. DOI:10.1161/01.RES.0000033522.37861.69. PMID12215493.