Cita APA (7a ed.)

Treanor, P. J. (1969). The Vatican Observatory. Specola Vaticana.

Cita Chicago Style (17a ed.)

Treanor, Patrick J. The Vatican Observatory. Città del Vaticano: Specola Vaticana, 1969.

Cita MLA (9a ed.)

Treanor, Patrick J. The Vatican Observatory. Specola Vaticana, 1969.