Cita APA (7a ed.)

Perry, L. S., & Caswell Perry, E. (1981). My friend Carl Sandburg: The biography of a friendship. Scarecrow Pr..

Cita Chicago Style (17a ed.)

Perry, Lilla S., y E. Caswell Perry. My Friend Carl Sandburg: The Biography of a Friendship. Metuchen, N.J. ; London: Scarecrow Pr., 1981.

Cita MLA (8a ed.)

Perry, Lilla S., y E. Caswell Perry. My Friend Carl Sandburg: The Biography of a Friendship. Scarecrow Pr., 1981.