APA

Hesse M., Hesse M., International Botanical Congress & International Botanical Congress. (1990). Morphology, development, and systematic relevance of pollen and spores. Wien [u.a.]: Springer.

Chicago

Hesse Michael, Hesse Michael, International Botanical Congress and International Botanical Congress. 1990. Morphology, development, and systematic relevance of pollen and spores. Wien [u.a.]: Springer.

Harvard

Hesse M., Hesse M., International Botanical Congress and International Botanical Congress. (1990). Morphology, development, and systematic relevance of pollen and spores. Wien [u.a.]: Springer.

MLA

Hesse Michael, Hesse Michael, International Botanical Congress and International Botanical Congress. Morphology, development, and systematic relevance of pollen and spores. Wien [u.a.]: Springer. 1990.