Heller, R. (2008). Achieving excellence; Influencing people; Balancing work and life. Dorling Kindersley.
Chicago-referens (17:e uppl.)Heller, Robert. Achieving Excellence; Influencing People; Balancing Work and Life. London: Dorling Kindersley, 2008.
MLA-referens (9:e uppl.)Heller, Robert. Achieving Excellence; Influencing People; Balancing Work and Life. Dorling Kindersley, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.