APA

Santayana G., Henfrey N., . (1968). Selected critical writings of George Santayana. Cambridge: At the University press.

Chicago

Santayana George, Henfrey Norman, . 1968. Selected critical writings of George Santayana. Cambridge: At the University press.

Harvard

Santayana G., Henfrey N., . (1968). Selected critical writings of George Santayana. Cambridge: At the University press.

MLA

Santayana George, Henfrey Norman, . Selected critical writings of George Santayana. Cambridge: At the University press. 1968.