Van't Hof, Thomas J. Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Bertolucci, C., Foa, A., & Van't Hof, T. J. (2002). Seasonal variations in circadian rhythms of plasma melatonin in ruin lizards. Hormones and Behavior, 41(4), 414-419. doi:10.1006/hbeh.2002.1781.