Παραπομπή APA

Paul Heyer. (2019). Communication in history - stone age symbols to social media.

Παραπομπή Chicago Style

Paul Heyer. Communication in History - Stone Age Symbols to Social Media. Routledge, 2019.

Παραπομπή MLA

Paul Heyer. Communication in History - Stone Age Symbols to Social Media. 2019.