APA (7th ed.) Citation

(2002). Strengthen your immune system. Reader's Digest (Australia).

Chicago Style (17th ed.) Citation

Strengthen Your Immune System. Syndey: Reader's Digest (Australia), 2002.

MLA (9th ed.) Citation

Strengthen Your Immune System. Reader's Digest (Australia), 2002.

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