Rodney H. True, Carl G. Hunkel (1898): The Poisonous Effect Exerted on Living Plants by Phenols. (Continued.) – Botanisches Centralblatt – 76: 321 - 327.
Rodney H. True, Carl G. Hunkel (1898): The Poisonous Effect Exerted on Living Piants by Phenols. (Continued.) – Botanisches Centralblatt – 76: 361 - 368.
Rodney H. True, Carl G. Hunkel (1898): The Poisonous Effect Exerted on Living Plants by Phenols. (Conclud.) – Botanisches Centralblatt – 76: 391 - 398.