TROLLE-SCHULTZ, E. Ralph L. Day: Marketing in Action: A Dynamic Business Decision Game. Richard D. Irwin, Homewood, Illinois. Ledelse og Erhvervsøkonomi, [S. l.], v. 26, 1962. Disponível em: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/33982. Acesso em: 5 jan. 2025.