Cita APA (7th ed.)

Piehler, J., & Hessler, J. (1968). Summ-summ brumm-brumm (1.-20. Tausend.). Helingsche Verlagsanstalt.

Cita Chicago (17th ed.)

Piehler, J., i J. Hessler. Summ-summ Brumm-brumm. 1.-20. Tausend. Leipzig: Helingsche Verlagsanstalt, 1968.

Cita MLA (8th ed.)

Piehler, J., i J. Hessler. Summ-summ Brumm-brumm. 1.-20. Tausend. Helingsche Verlagsanstalt, 1968.