Cita APA (7a ed.)

Hager, H., & Munshower, S. S. (1987). Light on the eternal city: Observations and discoveries. Pennsylvania State University.

Cita Chicago Style (17a ed.)

Hager, Hellmut, y Susan S. Munshower. Light on the Eternal City: Observations and Discoveries. Philadelphia: Pennsylvania State University, 1987.

Cita MLA (9a ed.)

Hager, Hellmut, y Susan S. Munshower. Light on the Eternal City: Observations and Discoveries. Pennsylvania State University, 1987.