Παραπομπή APA

Powell, R. E., & Shah, S. M. (1972). Summability theory and its applications.

Παραπομπή Chicago Style

Powell, R E., και S M. Shah. Summability Theory and Its Applications. Van Nostrand Reinhold Co., London, 1972.

Παραπομπή MLA

Powell, R E., και S M. Shah. Summability Theory and Its Applications. 1972.