APA (7th ed.) Citation

Ritter, H. (1971). Tape questions - tape answers / compiled by Heinz Ritter. Josef-Keller-Verlag.

Chicago Style (17th ed.) Citation

Ritter, Heinz. Tape Questions - Tape Answers / Compiled by Heinz Ritter. Starnberg: Josef-Keller-Verlag, 1971.

MLA (9th ed.) Citation

Ritter, Heinz. Tape Questions - Tape Answers / Compiled by Heinz Ritter. Josef-Keller-Verlag, 1971.

Warning: These citations may not always be 100% accurate.