Von Hesse, E. F. (1959). So to speak: A practical training course for developing a beautiful speaking voice (Rev. ed.). Lippincott.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVon Hesse, Elizabeth Ferguson. So to Speak: A Practical Training Course for Developing a Beautiful Speaking Voice. Rev. ed. Philadelphia: Lippincott, 1959.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVon Hesse, Elizabeth Ferguson. So to Speak: A Practical Training Course for Developing a Beautiful Speaking Voice. Rev. ed. Lippincott, 1959.
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