Google him.
When it is in a printed format such as a book the information is referred to as a citation. It includes size, medium, artist, and date.
Facebook has a page, Paintings by Evalyn Diffendaffer.
I have a Jo Mullen from the 1970s purchased in NYC !
I think this may be your artist: http://www.jsimonart.com/#!clowns Bear in mind that the style of his clowns was once, somewhat, different.
Enderby
John Enderby's birth name is John Edwin Enderby.
Samuel Enderby died in 1829.
Samuel Enderby was born in 1755.
Charles Enderby was born in 1798.
Charles Enderby died in 1876.
Enderby Outside has 243 pages.
Enderby Outside was created in 1968-05.
Enderby - rock band - ended in 1998.
Inside Mr. Enderby was created in 1963.
Kep Enderby was born on 1926-06-25.
Inside Mr. Enderby has 253 pages.