Παραπομπή APA

Weyl, H., & Helmer, O. (2009). Philosophy of mathematics and natural science. Princeton.

Παραπομπή Chicago Style

Weyl, Hermann, και Olaf Helmer. Philosophy of Mathematics and Natural Science. New Jersey: Princeton, 2009.

Παραπομπή MLA

Weyl, Hermann, και Olaf Helmer. Philosophy of Mathematics and Natural Science. Princeton, 2009.