Cita APA (7a ed.)

Whelan, J. P., & Butler, B. C. (1971). The spirituality of Friedrich von Hügel. Collins.

Cita Chicago Style (17a ed.)

Whelan, Joseph P., y Basil Christopher Butler. The Spirituality of Friedrich Von Hügel. London: Collins, 1971.

Cita MLA (9a ed.)

Whelan, Joseph P., y Basil Christopher Butler. The Spirituality of Friedrich Von Hügel. Collins, 1971.