Grigori is publishing a reprint of the edition (6 volumes) of the sources of Eastern Orthodox canon law by Rallis and Potlis which may be ordered at

This is the standard edition of the sources of Eastern Orthodox canon law, but it is not a critical edition strictly speaking and should therefore be used together with the critical (but sometimes flawed) edition of Joannou, CIC Orientalis Fontes Series I Fasc. IX (4 volumes), which can be ordered at

Joannou fails at times to include all the variants in his apparatus and the text ought therefore always be compared with Rallis/Potlis when critically evaluating the different readings in the grammatical interpretation of the sources.