Sgroi, R. J., & Sgroi, L. S. (1993). Mathematics for elementary school teachers: Problem-solving investigations. PWS-Kent.
Lua i Stíl Chicago (17ú heag.)Sgroi, Richard J., agus Laura S. Sgroi. Mathematics for Elementary School Teachers: Problem-solving Investigations. Boston: PWS-Kent, 1993.
Lua MLA (9ú heag.)Sgroi, Richard J., agus Laura S. Sgroi. Mathematics for Elementary School Teachers: Problem-solving Investigations. PWS-Kent, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.