MolluscaBase eds. (2024). MolluscaBase. Cardium (Trigoniocardia) affinis (E. T. Nelson, 1870) †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1739229 on 2024-08-01
new combination referenceSpieker, E. M. (1922). The paleontology of the Zorritos Formation of the north Peruvian oil fields. <em>The Johns Hopkins University, Studies in Geology.</em> 3: 1-197, pls. 1-10., available online athttps://www.biodiversitylibrary.org/page/19066928 page(s): 136, pl. 8, fig. 2-3 [details]