Tohutoro APA (7th ed.)
Eckhard, W. (1940). Houston Stewart Chamberlains Naturanschauung. Limburger Vereinsdr.
Tohutoru Kātū Chicago (17th ed.)
Eckhard, Waldtraut. Houston Stewart Chamberlains Naturanschauung. Limburg a. d. Lahn: Limburger Vereinsdr, 1940.
Tohutoro MLA (9th ed.)
Eckhard, Waldtraut. Houston Stewart Chamberlains Naturanschauung. Limburger Vereinsdr, 1940.
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