Interesting but I have always gone with Billboard's stance,  if you hit the Top 40 once you qualify but a few of these artists are anything but  one hit wonders, discounting the fact they had other big hits in their homelands. Just looking at US,  Archies had another Top 10 with Jingle Jangle,  The Knack had a # 11 with Good Girl's Don't, even  ? and Mysterians just missed the Top 20 with  I Need Somebody,  St Barry Sadler did reach the Top 30 again.  Just because some people only remember the biggest hits they had doesn't make them one hit wonders. 

If there is one artist  I would be loathe to label a one hit wonder ( and this creates  all hell let loose when this subject comes up  )  it is Jimi Hendrix.    Technically he is , and he is listed in One Hit Wonders Billboard book but it takes a brave man to mention him.    The leading example of a artist who had heaps of hits outside US and sometimes sanity has to prevail.   An example is when I was taken to task on a NZ board when labelling Zager And Evans one hit wonders as they had another big hit in NZ with Mr Turnkey. Come on,,, there has to be some international base line,  as someone could bring up some artist that had another hit in Turkey, so generally Billboard rules.   When Casey Kasem did his one hit wonders special way , way back Zager and Evans were # 1 as they only hit Top 100 once.  I wonder now if they have been overtaken by Los Del Rios and the Macarena. 

Scotty, what you just said about The Archies is ironic considering something else I had thought about mentioning last night: if they had never recorded "Sugar Sugar", many people would consider them to be one-hit wonders because of "Jingle Jangle". Same thing could be done with other artists who are labelled one-hit wonders despite having at least one other significant hit, and this is another way of showing why they shouldn't be classified that way.