The practice of optimism

MLA

Keller, Helen. The Practice of Optimism. London: Hodder & Stoughton, 1909.

APA

Keller, H. (1909). The practice of optimism. London: Hodder & Stoughton.

Chicago

Keller, Helen, The Practice of Optimism. London: Hodder & Stoughton, 1909.