Hammel, B. 2017. Peniocereus hirschtianus (amended version of 2013 assessment). The IUCN Red List of Threatened Species 2017: e.T152676A121603978. DOI: http://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T152676A121603978.en.
Online details: http://www.iucnredlist.org/details/152676/0