MENCHIRS ROBERT S. (1991). MATURE MARKET: A GOLD MINE OF IDEAS FOR TAPPING THE 50+. PROBUS PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)MENCHIRS ROBERT S. MATURE MARKET: A GOLD MINE OF IDEAS FOR TAPPING THE 50+. CHICAGO: PROBUS PUBLICATIONS, 1991.
Lua MLA (9ú heag.)MENCHIRS ROBERT S. MATURE MARKET: A GOLD MINE OF IDEAS FOR TAPPING THE 50+. PROBUS PUBLICATIONS, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.