Παραπομπή APA

Dennis , N., & NTM Dennis and T A Heppell. (1968). Vacuum System Desing. Chapaman and Hall.

Παραπομπή Chicago Style

Dennis , NTM, και NTM Dennis and T A Heppell. Vacuum System Desing. London: Chapaman and Hall, 1968.

Παραπομπή MLA

Dennis , NTM, και NTM Dennis and T A Heppell. Vacuum System Desing. Chapaman and Hall, 1968.