Schurer, F. (1965). On linear positive operators in approximation theory. Uitgeverij Waltman.
Lua i Stíl Chicago (17ú heag.)Schurer, Frans. On Linear Positive Operators in Approximation Theory. Delft: Uitgeverij Waltman, 1965.
Lua MLA (8ú heag.)Schurer, Frans. On Linear Positive Operators in Approximation Theory. Uitgeverij Waltman, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.