APA (7 वां संस्करण) प्रशस्ति पत्र
HELLEN, C. (1996). ALZHEIMER'S DISEASE. ACTIVITY-FOCUSED CARE. ANDOVER MEDICAL PUBLISHERS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
HELLEN, C.R. ALZHEIMER'S DISEASE. ACTIVITY-FOCUSED CARE. Londres: ANDOVER MEDICAL PUBLISHERS, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
HELLEN, C.R. ALZHEIMER'S DISEASE. ACTIVITY-FOCUSED CARE. ANDOVER MEDICAL PUBLISHERS, 1996.
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