Eckhard-Black, C., & Whittle, R. (1992). Cassell's contemporary German: A handbook of grammar current usage, and word power. Macmillan.
Citazione stile Chigago Style (17a edizione)Eckhard-Black, Christine, e Ruth Whittle. Cassell's Contemporary German: A Handbook of Grammar Current Usage, and Word Power. New York: Macmillan, 1992.
Citatione MLA (9a ed.)Eckhard-Black, Christine, e Ruth Whittle. Cassell's Contemporary German: A Handbook of Grammar Current Usage, and Word Power. Macmillan, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.