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|1.||Johnson, Jon||Federal Department official use of CPR perfins?||1985|
|2.||Johnson, Jon||Theory on the origin of the ND perforator [Department of National Defence]||1985|
|3.||Johnson, Jon||Milita department postal security||1991|
|4.||Tomasson, Gary||Five hole fakes rumor finally put to rest||1981|
|5.||Richardson, Ed.||Other Canadian official perfins - Federal issues||1956|
|6.||Rubec, C. D. A.||Perfins on Canadian federal and provincial revenue stamps||1982|