APA

Bullen K. E., . (19651963). An introduction to the theory of seismology. Cambridge, Eng: Cambridge University Press.

Chicago

Bullen Keith Edward, . 19651963. An introduction to the theory of seismology. Cambridge, Eng: Cambridge University Press.

Harvard

Bullen K. E., . (19651963). An introduction to the theory of seismology. Cambridge, Eng: Cambridge University Press.

MLA

Bullen Keith Edward, . An introduction to the theory of seismology. Cambridge, Eng: Cambridge University Press. 19651963.