Heitel, C., & Damerow, P. (1989). Mathematics, education and society: Reports and papers presented in .. Division of Science, Technical and Environmental Education, Unesco.
Lua i Stíl Chicago (17ú heag.)Heitel, Christine, agus Peter Damerow. Mathematics, Education and Society: Reports and Papers Presented in .. Paris: Division of Science, Technical and Environmental Education, Unesco, 1989.
Lua MLA (9ú heag.)Heitel, Christine, agus Peter Damerow. Mathematics, Education and Society: Reports and Papers Presented in .. Division of Science, Technical and Environmental Education, Unesco, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.