Time-Life Books. (1987). Getting firm: Shaping and toning. Time-Life Books.
Citazione stile Chigago Style (17a edizione)Time-Life Books. Getting Firm: Shaping and Toning. Alexandria, Virginia: Time-Life Books, 1987.
Citatione MLA (9a ed.)Time-Life Books. Getting Firm: Shaping and Toning. Time-Life Books, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.