Howie. Teaming with Your Therapy Dog. Purdue University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHowie. Teaming with Your Therapy Dog. Purdue University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHowie. Teaming with Your Therapy Dog. Purdue University Press.
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