APA

Santayana G., Lachs J. & Lachs S. (1969). Physical order and moral liberty: previously unpublished essays of George Santayana. [Nashville]: Vanderbilt University Press.

Chicago

Santayana George, Lachs John and Lachs Shirley. 1969. Physical order and moral liberty: previously unpublished essays of George Santayana. [Nashville]: Vanderbilt University Press.

Harvard

Santayana G., Lachs J. and Lachs S. (1969). Physical order and moral liberty: previously unpublished essays of George Santayana. [Nashville]: Vanderbilt University Press.

MLA

Santayana George, Lachs John and Lachs Shirley. Physical order and moral liberty: previously unpublished essays of George Santayana. [Nashville]: Vanderbilt University Press. 1969.