Lua APA (7ú heag.)
Spender, S., Bartlett, L., & Premoli, M. (1993). Caro Christopher: Lettere a Christopher Isherwood 1929-1939. R. Archinto.
Lua i Stíl Chicago (17ú heag.)
Spender, Stephen, Lee Bartlett, agus Marina Premoli. Caro Christopher: Lettere a Christopher Isherwood 1929-1939. Milano: R. Archinto, 1993.
Lua MLA (9ú heag.)
Spender, Stephen, et al. Caro Christopher: Lettere a Christopher Isherwood 1929-1939. R. Archinto, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.