Claassen, M. I. (1976). Freshwater Algae of Southern Africa: 3. Pleurotaenium Breve Raciborski Var. Engleri (Schmidle) Krieger and Penium Gonatozygiforme Claassen Sp. Nov. from Transvaal. Zenodo.
Tohutoru Kātū Chicago (17th ed.)Claassen, M Isabella. Freshwater Algae of Southern Africa: 3. Pleurotaenium Breve Raciborski Var. Engleri (Schmidle) Krieger and Penium Gonatozygiforme Claassen Sp. Nov. from Transvaal. Zenodo, 1976.
Tohutoro MLA (9th ed.)Claassen, M Isabella. Freshwater Algae of Southern Africa: 3. Pleurotaenium Breve Raciborski Var. Engleri (Schmidle) Krieger and Penium Gonatozygiforme Claassen Sp. Nov. from Transvaal. Zenodo, 1976.
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