APA (7th ed.) Citation
(1990). American English 1. Book 3. Tasks 49-72. ÚLEHLA.
Chicago Style (17th ed.) Citation
American English 1. Book 3. Tasks 49-72. Praha: ÚLEHLA, 1990.
MLA (9th ed.) Citation
American English 1. Book 3. Tasks 49-72. ÚLEHLA, 1990.
Warning: These citations may not always be 100% accurate.