APA (7th ed.) Citation

Oberwinkler, B., & Oberwinkler, F. (1970). Pterido- and Spermatophyta from Venezuela collected and determined: August 1968 - June 1969.

Chicago Style (17th ed.) Citation

Oberwinkler, B., and Franz Oberwinkler. Pterido- and Spermatophyta from Venezuela Collected and Determined: August 1968 - June 1969. [S.l.], 1970.

MLA (9th ed.) Citation

Oberwinkler, B., and Franz Oberwinkler. Pterido- and Spermatophyta from Venezuela Collected and Determined: August 1968 - June 1969. 1970.