Hope E, Pyman FL, Remfry FG, Robinson R (1931). "XXXI.—A synthesis of hydrastine. Part I". J. Chem. Soc.: 236–247. doi:10.1039/JR9310000236. ISSN0368-1769.
Haworth RD, Pinder AR (1950). "360. A new route to the phthalide-isoquinoline bases, and a synthesis of (–)-hydrastine". J. Chem. Soc.: 1776–1780. doi:10.1039/JR9500001776. ISSN0368-1769.
Hope E, Pyman FL, Remfry FG, Robinson R (1931). "XXXI.—A synthesis of hydrastine. Part I". J. Chem. Soc.: 236–247. doi:10.1039/JR9310000236. ISSN0368-1769.
Haworth RD, Pinder AR (1950). "360. A new route to the phthalide-isoquinoline bases, and a synthesis of (–)-hydrastine". J. Chem. Soc.: 1776–1780. doi:10.1039/JR9500001776. ISSN0368-1769.