Walther, S., Yamamoto, M., Thigpen, A. P., Willits, N. H., & Hart, L. A. (2019). Geographic Availability of Assistance Dogs: Dogs Placed in 2013–2014 by ADI- or IGDF-Accredited or Candidate Facilities in the United States and Canada, and Non-accredited U.S. Facilities. Front Vet Sci.

Walther, Sandra, Mariko Yamamoto, Abigail P. Thigpen, Neil H. Willits, και Lynette A. Hart. "Geographic Availability of Assistance Dogs: Dogs Placed in 2013–2014 By ADI- or IGDF-Accredited or Candidate Facilities in the United States and Canada, and Non-accredited U.S. Facilities." Front Vet Sci 2019.

Walther, Sandra, et al. "Geographic Availability of Assistance Dogs: Dogs Placed in 2013–2014 By ADI- or IGDF-Accredited or Candidate Facilities in the United States and Canada, and Non-accredited U.S. Facilities." Front Vet Sci 2019.