Adams, Michael J.; Bury, R. Bruce; Swarts, Scott A. (1998). "Amphibians of the Fort Lewis Military Reservation, Washington: Sampling Techniques and Community Patterns". Northwestern Naturalist. 79 (1): 12–18. doi:10.2307/3536812. JSTOR3536812.
Adams, Michael J.; Bury, R. Bruce; Swarts, Scott A. (1998). "Amphibians of the Fort Lewis Military Reservation, Washington: Sampling Techniques and Community Patterns". Northwestern Naturalist. 79 (1): 12–18. doi:10.2307/3536812. JSTOR3536812.