APA (7 वां संस्करण) प्रशस्ति पत्र
CERNA, M. (1989). CHILDREN WITH PROFOUND RETARDATION AND THEIR JOINT TRAINING WITH PARENTS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
CERNA, M. CHILDREN WITH PROFOUND RETARDATION AND THEIR JOINT TRAINING WITH PARENTS. 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
CERNA, M. CHILDREN WITH PROFOUND RETARDATION AND THEIR JOINT TRAINING WITH PARENTS. 1989.
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