Ripley, A., & Ferris, L. (1992). Forty plus : use it, or lose it! the ultimate fitness guide / Andy Ripley & Liz Ferris: Use it, or lose it! the ultimate fitness guide. Stanley Paul.
Chicago Style (17th ed.) CitationRipley, Andy, and Liz Ferris. Forty Plus : Use It, or Lose It! the Ultimate Fitness Guide / Andy Ripley & Liz Ferris: Use It, or Lose It! the Ultimate Fitness Guide. London: Stanley Paul, 1992.
MLA (9th ed.) CitationRipley, Andy, and Liz Ferris. Forty Plus : Use It, or Lose It! the Ultimate Fitness Guide / Andy Ripley & Liz Ferris: Use It, or Lose It! the Ultimate Fitness Guide. Stanley Paul, 1992.
Warning: These citations may not always be 100% accurate.