Alpine Harper was lead writer on Flippity and Flop strips and Cecil Beard was lead on Twiddle and Twaddle. However, they were a husband and wife team known to write collaboratively. Owen Fitzgerald is credited as drawing one or more Flippity and Flop strips sometime in 1957, but all art in this issue appears to be Jim Davis' work. Credits by Jerry Bails at
http://www.bailsprojects.com/.
On-sale date from copyright registration.