Cita APA

Porter, M. W., & Spiller, R. C. (1951). The Barker index of crystals. W. Heffer.

Citación estilo Chicago

Porter, M. W., and R. C. Spiller. The Barker Index of Crystals. Cambridge: W. Heffer, 1951.

Cita MLA

Porter, M. W., and R. C. Spiller. The Barker Index of Crystals. Cambridge: W. Heffer, 1951.