Endosymbiosis of animals with plant microorganisms.
- Rev. Eng. ed. [Translated by Bertha Mueller, with the collaboration of Francis H. Fockier]. Rev. Eng. ed. [Translated by Bertha Mueller, with the collaboration of Francis H. Fockier].
- New York, Interscience Publishers [1965]
Orig. published as Endosymbiosis der Tiere mit pflanzlichen Mikroorganismen, 1953.