Chan, W.-H. and Kaufman, P.E. 2009. American Dog Tick, Dermacentor variabilis (Say) (Arachnida: Ixodida: Ixodidae): EENY-443/IN781, 11/2008. EDIS. 2009, 1 (Jan. 2009). DOI:https://doi.org/10.32473/edis-in781-2008.