Question: I would like to know how to reference guidelines recommended by a Council?

You would reference this document as an internet source.

See Harvard internet example on the Referencing tab of the Find, access and use information effectively: a step-by-step guide

Guidelines for using charts and graphs. 2005. [Online]. Available: http://www.sandhills.edu/academic-departments/english/wordguide/chartadvice.html  [2006, February 23].