Bey, V., Concheff, B. J., & Yates, J. (2017). Spanish verb drills (Fifth edition.). McGraw-Hill Education.
Citace podle Chicago (17th ed.)Bey, Vivienne, Beatrice Jorgensen Concheff, a Jean Yates. Spanish Verb Drills. Fifth edition. New York: McGraw-Hill Education, 2017.
Citace podle MLA (9th ed.)Bey, Vivienne, et al. Spanish Verb Drills. Fifth edition. McGraw-Hill Education, 2017.
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