Wells, D. (1988). Mathematics through problem solving ; problem book 2 /David Wells. Basil Blackwood.
Lua i Stíl Chicago (17ú heag.)Wells, David. Mathematics Through Problem Solving ; Problem Book 2 /David Wells. England: Basil Blackwood, 1988.
Lua MLA (9ú heag.)Wells, David. Mathematics Through Problem Solving ; Problem Book 2 /David Wells. Basil Blackwood, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.