Ecological, behavioral, and nutritional aspects of the Wyoming pika, Ochotona princeps ventorum, were studied in June, July, and August of 1971. Project Number 180.
Engler, K. Dale
"Ecology, Behavior and Nutrition of the Pika,"
Jackson Hole Research Station Annual Report: Vol. 1971
, Article 13.
Available at: http://repository.uwyo.edu/jhrs_reports/vol1971/iss1/13