Rush, J. (1867). The philosophy of the human voice: Embracing its physiological history; together with a system of principles, by which criticism in the art of elocution may be rendered intelligible, and instruction, definite and comprehensive. To which is added A brief analysis of song and recitative. (6th ed., enl.). Lippincott.

Rush, James. The Philosophy of the Human Voice: Embracing Its Physiological History; Together with a System of Principles, by Which Criticism in the Art of Elocution May Be Rendered Intelligible, and Instruction, Definite and Comprehensive. To Which Is Added A Brief Analysis of Song and Recitative. 6th ed., enl. Lippincott, 1867.