Haeckel, his life and work - Bölsche, Wilhelm, 1861-1939.; McCabe, Joseph, 1867-1955 (London : T.F. Unwin, 1906)
Bibliography: List of the works by ... Haeckel that have been translated into English, p. 323-324; Complete list of Prof. Haeckel's works (exclusive of articles in scientific periodicals, etc.), p. 324-327.
Keywords: Haeckel, Ernst, -- 1834-1919.; Evolution (Biology) -- History