Cita APA (7a ed.)

Barker, M., & Wagner, E. J. German: Intonation & verse speaking. Linguaphone Institute.

Cita Chicago Style (17a ed.)

Barker, M.L, y Else Johanssen Wagner. German: Intonation & Verse Speaking. London: Linguaphone Institute.

Cita MLA (9a ed.)

Barker, M.L, y Else Johanssen Wagner. German: Intonation & Verse Speaking. Linguaphone Institute.