APA (7 वां संस्करण) प्रशस्ति पत्र

KRAMER, K. (1978). Teaching elementary school mathematics.-- Ed.4. Allyn and Bacon.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

KRAMER, Klaas. Teaching Elementary School Mathematics.-- Ed.4. Boston: Allyn and Bacon, 1978.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

KRAMER, Klaas. Teaching Elementary School Mathematics.-- Ed.4. Allyn and Bacon, 1978.