Hughes, J., Stephenson, H., & Dummett, P. (2013). Life: Pre-Intermediate. Student's Book (1a. ed.). National Geographic Learning.
Citace podle Chicago (17th ed.)Hughes, John, Helen Stephenson, a Paul Dummett. Life: Pre-Intermediate. Student's Book. 1a. ed. Hampshire: National Geographic Learning, 2013.
Citace podle MLA (9th ed.)Hughes, John, et al. Life: Pre-Intermediate. Student's Book. 1a. ed. National Geographic Learning, 2013.
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