^Galzin AM, Eon MT, Esnaud H, Lee CR, Pévet P, Langer SZ. Day-night rhythm of 5-methoxytryptamine biosynthesis in the pineal gland of the golden hamster (Mesocricetus auratus).. J. Endocrinol. 1988, 118 (3): 389–397. PMID 2460575. doi:10.1677/joe.0.1180389.