WALTERS LILLY. (2000). SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? TATA MCGRAW-HILL.
Chicago-referens (17:e uppl.)WALTERS LILLY. SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? NEW DELHI: TATA MCGRAW-HILL, 2000.
MLA-referens (9:e uppl.)WALTERS LILLY. SECRETS OF SUPERSTAR SPEAKERS: WISDOM FROM GREATEST MOTIVATORS OF OUR TIME AND WITH THOSE ? TATA MCGRAW-HILL, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.