Blitghingyon, W. P. (1981). The energy and vitality book. Living Books.
Cita Chicago (17th ed.)Blitghingyon, W. Peter. The Energy and Vitality Book. Living Books, 1981.
Cita MLA (9th ed.)Blitghingyon, W. Peter. The Energy and Vitality Book. Living Books, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.