Nolan, E. J., Rhoads, S. N., Brinton, D. G., & Smith, J. B. (1897). Proceedings of a meeting held in commemoration of Harrison Allen, M.D. and George Henry Horn, M.D. Philadelphia: the Academy of Natural Sciences.

Nolan, Edward J., Samuel N. Rhoads, Daniel Garrison Brinton, and John Bernhard Smith. Proceedings of a Meeting Held in Commemoration of Harrison Allen, M.D. and George Henry Horn, M.D. Philadelphia: the Academy of Natural Sciences, 1897.

Nolan, Edward J., Samuel N. Rhoads, Daniel Garrison Brinton, and John Bernhard Smith. Proceedings of a Meeting Held in Commemoration of Harrison Allen, M.D. and George Henry Horn, M.D. Philadelphia: the Academy of Natural Sciences, 1897.