• De Byl. P. & Hooper. J. (2013). 30th ASCILITE Conference Proceedings. Key attributes of engagement in gamified learning environment. http://www.ascilite.org/conferences/sydney13/program/papers/de%20Byl.pdf.

• Designing Digitally, Inc. (2014). PETSYNC: Living with a dog in a shared community case-study. https://www.youtube.com/watch?v=KQ9ZX_kwk6Q

• Kapp. K. (2012). Training Industry Quarterly. 5 Gaming elements for effective e-Learning. http://www.nxtbook.com/nxtbooks/trainingindustry/tiq_2012fall/#/30

• Kapp. K. (2014). ATD. 10 Best practices for implementing gamification. https://www.td.org/Publications/Blogs/Learning-Technologies-Blog/2014/02/10-Best-Practices-for-Implementing-Gamification.

• Squires. J. (2014). Docebo. Stop boring content: Gamify your learning in 8 steps that make a difference!https://www.docebo.com/2014/07/10/stop-boring-content-gamify-your-learning-in-8-steps/

• Wexler. S., Aldrich. C., Johannigman. J., Oehlert. M., Quinn. C., & van Barneveld. A. (2007). eLearning Guild. Immersive learning simulations. http://www.elearningguild.com/research

• Bloody Controller - http://www.themarysue.com/wp-content/uploads/2012/12/xboxviolence_550.jpg#geekosystem

• Call of Duty - http://www.superbwallpapers.com/games/call-of-duty-ghosts-28414/

• Check Mark Badge - http://cache4.asset-cache.net/gc/457728909-check-mark-gettyimages.jpg?v=1&c=IWSAsset&k=2&d=yyfPsZRmrvlE5WZH%2BWmuxOEvq0zWiINqQ%2FDg5NdRq6U%3D

• Controller - http://thumb1.shutterstock.com/display_pic_with_logo/949135/191025824/stock-vector-vector-set-of-gamification-icons-for-design-vector-icons-191025824.jpg

• Feedback: http://www.adweek.com/socialtimes/wp-content/uploads/sites/2/2011/06/FishHunt-21.png

• Game Board - http://cdn2.hubspot.net/hub/55581/file-17434647-jpg/images/taking_gamification_to_the_next_b2b_level.jpg

• Game Over –https://entertainmentlawbrazil.files.wordpress.com/2012/03/game_over.jpg

• Game Play - http://3.bp.blogspot.com/-_2xiw_LvO-M/UBV9nB-KnII/AAAAAAAAADk/KPL-Sn2PKo8/s1600/Gameplay.gif

• Game Start - http://blog.pgi.com/wp-content/uploads/2012/05/press_start11.jpg

• Gamification Badge - http://www.connorboyack.com/img/gamification.png

• High Score - http://highscore.com/images/high_score_320x320.png

• Level Up - http://sabreuse.com/soylent/images/super-mario-bros.jpg

• PacMan - http://techmea.com/wp-content/uploads/2014/08/gaming-backgrounds.jpg

• Multiplayer Characters - http://i.ytimg.com/vi/ZhGMlEYewuk/maxresdefault.jpg

• Star Badge - https://cdn0.iconfinder.com/data/icons/gamification-flat-awards-and-badges/500/star1-512.png

• Star Trophy Badge - http://static.lalawag.com/wp-content/uploads/newbie1.png

• User Experience - http://www.gulosolutions.com/wp-content/uploads/2014/09/gamification-user-experience.jpg

• Winner - http://0.media.collegehumor.cvcdn.com/10/69/09577a42f734baa7f390acdf1972a46d.jpg

• Words With Frieds - http://www.blogcdn.com/blog.games.com/media/2012/01/words-with-friends-free-thumb.png

• Zelda - http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Zelda_Logo.svg/2000px-Zelda_Logo.svg.png