About.com, A Beginner's Guide to Economic IndicatorsArchived 2009-08-31 at the Wayback Machine, retrieved November 2009. This was the source of "procyclic", "acyclic", etc., as well as confirmation of "leading", "lagging", etc., and the source of some of the examples.
Yamarone, Richard (2012). "Indexes of Leading, Lagging, and Coincident Indicators". The Trader's Guide to Key Economic Indicators. John Wiley & Sons, Inc. pp. 47–63. doi:10.1002/9781118532461.ch2. ISBN9781118532461.
About.com, A Beginner's Guide to Economic IndicatorsArchived 2009-08-31 at the Wayback Machine, retrieved November 2009. This was the source of "procyclic", "acyclic", etc., as well as confirmation of "leading", "lagging", etc., and the source of some of the examples.
