^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Pittler SJ, Baehr W, Wasmuth JJ, McConnell DG, Champagne MS, vanTuinen P, Ledbetter D, Davis RL (February 1990). "Molecular characterization of human and bovine rod photoreceptor cGMP phosphodiesterase alpha-subunit and chromosomal localization of the human gene". Genomics. 6 (2): 272–83. doi:10.1016/0888-7543(90)90567-E. PMID2155175.