The author proposes great refcards under CC-BY-NC-SA license:
https://michaelgoerz.net/refcards/
There is also the Tobias Burnus’ refcard (Fortran 2003):
http://users.physik.fu-berlin.de/~tburnus/gcc-trunk/FortranRef/
In each case, the “sources” are available.
Another one that disappeared from this link:
http://www.mie.uth.gr/ekp_yliko/fortran_quick_reference_cheat_crib_sheet.pdf
but can be found here: