Παραπομπή σε μορφή APA (7η εκδ.)

Singer, I. (1974). The theory of best approximation and functional analysis. Society for Industrial and Applied Mathematics.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Singer, Ivan. The Theory of Best Approximation and Functional Analysis. Philadelphia: Society for Industrial and Applied Mathematics, 1974.

Παραπομπή σε μορφή MLA (9th εκδ.)

Singer, Ivan. The Theory of Best Approximation and Functional Analysis. Society for Industrial and Applied Mathematics, 1974.