Blavatsky, H. P. (Helena Petrovna)., Tingley, K. Augusta Westcott. (1889). The key to theosophy: being a clear exposition in the form of question and answer of the ethics, science, and philosophy for the study of which the Universal brotherhood and Theosophical society has been founded. London: Theosophical publishing society.MLA Citation
Blavatsky, H. P. (Helena Petrovna), 1831-1891, and Katherine Augusta Westcott Tingley. The Key to Theosophy: Being a Clear Exposition In the Form of Question And Answer of the Ethics, Science, And Philosophy for the Study of Which the Universal Brotherhood And Theosophical Society Has Been Founded. London: Theosophical publishing society, 1889.
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