Crowley, D. J., & Heyer, P. (1995). Communication in history: Technology, culture, society (2nd ed.). Longman Publishers USA.
Citace podle Chicago (17th ed.)Crowley, D. J., a Paul Heyer. Communication in History: Technology, Culture, Society. 2nd ed. White Plains, N.Y: Longman Publishers USA, 1995.
Citace podle MLA (9th ed.)Crowley, D. J., a Paul Heyer. Communication in History: Technology, Culture, Society. 2nd ed. Longman Publishers USA, 1995.
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