Zastrow Charles & Kirst-Ashman, K. K. (1990). Understanding human behavior and the social environment (Second edition.). Nelson-Hall Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रZastrow Charles और Karen Kay Kirst-Ashman. Understanding Human Behavior and the Social Environment. Second edition. Chicago: Nelson-Hall Publishers, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रZastrow Charles और Karen Kay Kirst-Ashman. Understanding Human Behavior and the Social Environment. Second edition. Nelson-Hall Publishers, 1990.
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