"RHS Plant Selector - Ferocactus glaucescens".
Retrieved 2 July 2020.

"AGM Plants - Ornamental" (PDF).
Royal Horticultural Society.
July 2017.
p. 39.
Retrieved 26 February 2018.

Ferocactus glaucescens forma nuda (inermis)
"RHS Plant Selector - Ferocactus glaucescens". Retrieved 2 July 2020.
"AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 39. Retrieved 26 February 2018.
Ferocactus glaucescens forma nuda (inermis)
Ferocactus glaucescens