APA (7th ed.) Citation

Tölken, H. R. (1971). Index herbariorum austro - africanum.

Chicago Style (17th ed.) Citation

Tölken, H. R. Index Herbariorum Austro - Africanum. [S.l.], 1971.

MLA (9th ed.) Citation

Tölken, H. R. Index Herbariorum Austro - Africanum. 1971.

Warning: These citations may not always be 100% accurate.