APA (7th ed.) Citation

Bullen, K. E. (1953). An introduction to the theory of seismology (2. ed.). Univ. Press.

Chicago Style (17th ed.) Citation

Bullen, Keith E. An Introduction to the Theory of Seismology. 2. ed. Cambridge: Univ. Press, 1953.

MLA (9th ed.) Citation

Bullen, Keith E. An Introduction to the Theory of Seismology. 2. ed. Univ. Press, 1953.