एपीए उद्धरण

Roberts, W. H. (1941). The problem of choice: An introduction to ethics. Boston: Atheneum Press.

शिकागो स्टाइल उद्धरण

Roberts, William Hehry. The Problem of Choice: An Introduction to Ethics. Boston: Atheneum Press, 1941.

एमएलए उद्धरण

Roberts, William Hehry. The Problem of Choice: An Introduction to Ethics. Boston: Atheneum Press, 1941.