Second date is the cover date.
in 52 (DC, 2007 series) #4 ([November] 2007)
in The 52 Omnibus (DC, 2012 series) #[nn] (October 2012)Inside front cover.
in 52 (DC, 2007 series) #4 ([November] 2007)
in The 52 Omnibus (DC, 2012 series) #[nn] (October 2012)Page 5 and bottom of page 7.
Top of page 7.
Page 9.
Page 13.
Page 17.
Page 20.
Page 24.
Inside back cover.
Back cover.