On sale date from house ad in The Flash (DC, 1959 series) #158.
Pencilling and inking credits per Julius Schwartz' editorial records. Inking formerly credited to Murphy Anderson and Bernard Sachs. Lettering credit from reprint in JLA Archives.
Lettering credit from reprint in JLA Archives. Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2007).