Weatherley, A. H. (1963-03-01). "A Note on the Head Kidney and Kidney of the Perch Perca Fluviatilis (linnaeus), with Special Reference to the Blood Vascular System". Proceedings of the Zoological Society of London (dalam bahasa Inggris). 140 (2): 161–167. doi:10.1111/j.1469-7998.1963.tb01859.x. ISSN1469-7998.
Weatherley, A. H. (1963-03-01). "A Note on the Head Kidney and Kidney of the Perch Perca Fluviatilis (linnaeus), with Special Reference to the Blood Vascular System". Proceedings of the Zoological Society of London (dalam bahasa Inggris). 140 (2): 161–167. doi:10.1111/j.1469-7998.1963.tb01859.x. ISSN1469-7998.