Chiefs-Lions NFL Week 1: Detroit has clear advantage in one area - Arrowhead Pride
PFF lists Chiefs' Creed Humphrey among NFL's elite centers - Arrowhead Pride
ProHogs in the NFL – Week 1 Report
ESPN Ranks Detroit Lions Frank Ragnow Best Center in NFL - Sports Illustrated Detroit Lions News, Analysis and More
Detroit Lions Frank Ragnow Fifth Year Option NFL Contract - Sports Illustrated Detroit Lions News, Analysis and More
Washington Commanders NFL free agency options: Offensive Guards & Centers - Hogs Haven
Detroit Lions center Frank Ragnow named to Pro Bowl for second time
Detroit Lions' Frank Ragnow named top-3 center by NFL insiders
Detroit Lions re-sign backup offensive lineman Ross Pierschbacher
Detroit Lions are set to make Frank Ragnow the NFL's highest-paid center, NFL News
Detroit Lions making Frank Ragnow NFL's top-paid center, source says - ESPN
Finally healthy, Detroit Lions OL anxious to show everyone how good it can be