Luck, L., List, H., Middell, G., & Hybler, Z. (1990). English step by step: English for beginners and an elementary refresher course, English for intermediate learners, English for advanced learners and scientiests (8., unveränd. Aufl.). Verlag Enzyklopädie.
Citace podle Chicago (17th ed.)Luck, Lydia, Horst List, Gudrun Middell, a Zdenek Hybler. English Step by Step: English for Beginners and an Elementary Refresher Course, English for Intermediate Learners, English for Advanced Learners and Scientiests. 8., unveränd. Aufl. Leipzig: Verlag Enzyklopädie, 1990.
Citace podle MLA (8th ed.)Luck, Lydia, et al. English Step by Step: English for Beginners and an Elementary Refresher Course, English for Intermediate Learners, English for Advanced Learners and Scientiests. 8., unveränd. Aufl. Verlag Enzyklopädie, 1990.