APA (7 वां संस्करण) प्रशस्ति पत्र

Heardman, H., & Ebner, M. (1982). Relaxation and exercise for natural childbirth (5th ed.). Churchill Livingstone.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Heardman, Helen, और Maria Ebner. Relaxation and Exercise for Natural Childbirth. 5th ed. Edinburgh: Churchill Livingstone, 1982.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Heardman, Helen, और Maria Ebner. Relaxation and Exercise for Natural Childbirth. 5th ed. Churchill Livingstone, 1982.