Roberto, N. (2002). Strategic market segmentation: How to market to the rich, the middle class and the "masa". Lifecycle Press.
Lua i Stíl Chicago (17ú heag.)Roberto, Ned. Strategic Market Segmentation: How to Market to the Rich, the Middle Class and the "Masa". Makati City: Lifecycle Press, 2002.
Lua MLA (9ú heag.)Roberto, Ned. Strategic Market Segmentation: How to Market to the Rich, the Middle Class and the "Masa". Lifecycle Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.