"Glen Schofield and Michael Condrey's Sledgehammer Games: Growing the Call of Duty Franchise".
“Glen Schofield and Michael Condrey's Sledgehammer Games: Growing the Call of Duty Franchise“, 21 თებერვალი, 2013. წაკითხვის თარიღი: 1 მარტი, 2013.  ↑ Sledgehammer Games: Inside the Studio.