APA (7th ed.) Citation

Reader's Digest. (2000). The Heart & Circulatory System. Reader's Digest.

Chicago Style (17th ed.) Citation

Reader's Digest. The Heart & Circulatory System. London: Reader's Digest, 2000.

MLA (9th ed.) Citation

Reader's Digest. The Heart & Circulatory System. Reader's Digest, 2000.

Warning: These citations may not always be 100% accurate.