APA
Lean G. F., American Catholic Philosophical Association, . (1978). Immateriality. Washington: Issued by the Office of the National Secretary of the Association, The Catholic University of American.
Chicago
Lean George F, American Catholic Philosophical Association, . 1978. Immateriality. Washington: Issued by the Office of the National Secretary of the Association, The Catholic University of American.
Harvard
Lean G. F., American Catholic Philosophical Association, . (1978). Immateriality. Washington: Issued by the Office of the National Secretary of the Association, The Catholic University of American.
MLA
Lean George F, American Catholic Philosophical Association, . Immateriality. Washington: Issued by the Office of the National Secretary of the Association, The Catholic University of American. 1978.
