receipts is safeguarded by a constant process of re-evaluating the ticket prices. (The average price in 1957 was only 1.33 F.)" ^ a b Xiao, Zhiwei; Zhang
Mayweather vs. Manny Pacquiao PPV price set for $89.95 in SD, up to $99.95 for HD”. Bloody Elbow (2015年4月3日). 2015年8月1日閲覧。 ^ a b “Bob Arum: Pacquiao-Bradley
masterly by Marie de LaFayette. online edition 1702: Abbe Bellegarde, "Lettre à une Dame de la Cour, qui lui avoit demandé quelques Reflexions sur l'Histoire"