Anceschi, Giovanna; Magli, Alberto (2018). "A synopsis of the genusParodiaSpegazzini s.l. (Cactaceae)". Bradleya. 36 (36). British Cactus and Succulent Society: 70–161. doi:10.25223/brad.n36.2018.a9. ISSN0265-086X. S2CID92389189.
Anceschi, Giovanna; Magli, Alberto (2018). "A synopsis of the genusParodiaSpegazzini s.l. (Cactaceae)". Bradleya. 36 (36). British Cactus and Succulent Society: 70–161. doi:10.25223/brad.n36.2018.a9. ISSN0265-086X. S2CID92389189.
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Anceschi, Giovanna; Magli, Alberto (2018). "A synopsis of the genusParodiaSpegazzini s.l. (Cactaceae)". Bradleya. 36 (36). British Cactus and Succulent Society: 70–161. doi:10.25223/brad.n36.2018.a9. ISSN0265-086X. S2CID92389189.