On-sale date from copyright registration.
Pencils credit per Bob Klein, Gene Reed, Mike Tiefenbacher, and Bob Hughes. Craig Delich and Pat Lang credit Jim Mooney. Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Inside front cover.
Inks credit per Craig Delich and Pat Lang. Bob Klein and Gene Reed credit Philip Kelsey.
Writer credit from Showcase Presents Green Arrow #1.
Avg Circ: 480,000
Publisher:National Periodical Publications, Inc.
Editor: Jack Schiff
Owners: H. Donenfeld,I. Donenfeld, S. Iger, H. Donenfeld Foundation, J. Liebowitz, P. Sampliner, S. Sampliner
575 Lexington Ave, NY, NY
Inside back cover.