APA (7th ed.) Citation

Gordon, J. E. (1978). Structures: Or, Why things don't fall down. Penquin Books.

Chicago Style (17th ed.) Citation

Gordon, J. E. Structures: Or, Why Things Don't Fall Down. Harmondsworth, New York: Penquin Books, 1978.

MLA (9th ed.) Citation

Gordon, J. E. Structures: Or, Why Things Don't Fall Down. Penquin Books, 1978.