1.		Resort cycle revisited : the retirement connection / Danny M. Foster, Peter E. Murphy Autor: Foster, Danny M. Coautor: ; Murphy, Peter E.
2.		Papers on the over 50s in the 90s : factors for successful marketing of products and services / European Society for Opinion and Marketing Research Data Publicação: [1991?] Coautor: Hesse, Wolfgang Boggia, Raimondo Martin, Barbara Yesk, Albert J. Kerr, Douglas Llewellyn, Brendan Donaubauer, Jochen Brandhorst, Bernhard Filomarino, Beatrice Cito Camden, Debra McColl-Kennedy, Janet Drummond, Vicki Smith, Greg Kreitzman, Leon Ziegler, Margret Chicou, Hubert