Rocha, José Bernardo; Mascarenhas, Samuel; Prada, Rui: Game Mechanics for Cooperative Games. ZON Digital Games 2008, 2008, s. 73-80. ISBN 978-989-95500-25. Artikkelin verkkoversio (pdf). (englanniksi) (Arkistoitu – Internet Archive)
web.archive.org
Rocha, José Bernardo; Mascarenhas, Samuel; Prada, Rui: Game Mechanics for Cooperative Games. ZON Digital Games 2008, 2008, s. 73-80. ISBN 978-989-95500-25. Artikkelin verkkoversio (pdf). (englanniksi) (Arkistoitu – Internet Archive)