Hobbs, D. E. (1980). The effect of habitat sound properties on alarm calling behavior in two species of tree squirrels (Sciurus Nayaritensis and Sciurus Arizonensis. University Microfilms International.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hobbs, Donna Edeen. The Effect of Habitat Sound Properties on Alarm Calling Behavior in Two Species of Tree Squirrels (Sciurus Nayaritensis and Sciurus Arizonensis. Ann Arbor, Mich.: University Microfilms International, 1980.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hobbs, Donna Edeen. The Effect of Habitat Sound Properties on Alarm Calling Behavior in Two Species of Tree Squirrels (Sciurus Nayaritensis and Sciurus Arizonensis. University Microfilms International, 1980.
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