Note 22 — PLANT SOURCES OF CAMPHOR, BORNEOL, AND CINEOL (EUCALYPTOL).
Reading edition
Power, F. B., and Kleber, C. The Constituents of American Peppermint Oil, and a Method for the Quantitative Determination of Menthol. Pharmaceutische Rundschau, vol. 12, 1894, pp. 157–165.