APA استشهاد

Kral, J. e. a. (1987). Potential theory: :surveys and problems. Springer - Verlag.

استشهاد بنمط شيكاغو

Kral, J et al.. Potential Theory: :surveys and Problems. Berlin: Springer - Verlag, 1987.

MLA استشهاد

Kral, J et al.. Potential Theory: :surveys and Problems. Springer - Verlag, 1987.