history of the Oath of Citizenship

[FATCA]

Please direct me to authoritative sources regarding any changes in the Oath of Citizenship during the 1970's, with details of the successive versions.

[Leon]

According to http://en.wikipedia.org/wiki/Oath_of_Citizenship_(Canada) they have only changed the oath once, in 1977 when they added "Queen of Canada" after the name of the Queen.

This is currently the oath:

I swear (or affirm) that I will be faithful and bear true allegiance to Her Majesty Queen Elizabeth the Second, Queen of Canada, Her Heirs and Successors, and that I will faithfully observe the laws of Canada and fulfil my duties as a Canadian citizen.

[FATCA]

A government source would be more authoritative than Wikipedia.  How can one find the official description of dates of changes?

[Baloo]

A government source would be more authoritative than Wikipedia.  How can one find the official description of dates of changes?

Leon has provided the correct answer; bBt if you don't want to believe his statement, you can always start searching the Canadian Government websites.

The current details are here.
http://www.cic.gc.ca/english/citizenship/cit-ceremony.asp