Gantz I, Muraoka A, Yang YK, Samuelson LC, Zimmerman EM, Cook H, Yamada T (Sep 1997). „Cloning and chromosomal localization of a gene (GPR18) encoding a novel seven transmembrane receptor highly expressed in spleen and testis”. Genomics42 (3): 462–6. DOI:10.1006/geno.1997.4752. PMID9205118.
Kohno M, Hasegawa H, Inoue A, Muraoka M, Miyazaki T, Oka K, Yasukawa M (September 2006). „Identification of N-arachidonylglycine as the endogenous ligand for orphan G-protein-coupled receptor GPR18”. Biochemical and Biophysical Research Communications347 (3): 827–32. DOI:10.1016/j.bbrc.2006.06.175. PMID16844083.
Gantz I, Muraoka A, Yang YK, Samuelson LC, Zimmerman EM, Cook H, Yamada T (Sep 1997). „Cloning and chromosomal localization of a gene (GPR18) encoding a novel seven transmembrane receptor highly expressed in spleen and testis”. Genomics42 (3): 462–6. DOI:10.1006/geno.1997.4752. PMID9205118.
Kohno M, Hasegawa H, Inoue A, Muraoka M, Miyazaki T, Oka K, Yasukawa M (September 2006). „Identification of N-arachidonylglycine as the endogenous ligand for orphan G-protein-coupled receptor GPR18”. Biochemical and Biophysical Research Communications347 (3): 827–32. DOI:10.1016/j.bbrc.2006.06.175. PMID16844083.