Root, A. I., & Root, E. R. (1923). The ABC and XYZ of bee culture - A cyclopedia of everyhing pertaining to the care of the honeybee: Bees, hives, honey, implements, honey plants, etc. Facts gleaned from the experience of thousands of beekeepers, and afterward verified by the authors. Ohio: The A. I. Root Company.

Root, A. I., and E. R. Root. The ABC and XYZ of Bee Culture - A Cyclopedia of Everyhing Pertaining to the Care of the Honeybee: Bees, Hives, Honey, Implements, Honey Plants, Etc. Facts Gleaned From the Experience of Thousands of Beekeepers, and Afterward Verified By the Authors. Ohio: The A. I. Root Company, 1923.

Root, A. I., and E. R. Root. The ABC and XYZ of Bee Culture - A Cyclopedia of Everyhing Pertaining to the Care of the Honeybee: Bees, Hives, Honey, Implements, Honey Plants, Etc. Facts Gleaned From the Experience of Thousands of Beekeepers, and Afterward Verified By the Authors. Ohio: The A. I. Root Company, 1923.