The theorems of Beth and Craig in abstract model theory. I. The abstract setting. Makowsky, J. A. & Shelah, S. Transactions of the American Mathematical Society, 256:215–239, 1979.
bibtex   
@article{MwSh:62,
author = {Makowsky, Johann A. and Shelah, Saharon},
ams-subject = {(03C80)},
journal = {Transactions of the American Mathematical Society},
review = {MR 81b:03041},
pages = {215--239},
title = {{The theorems of Beth and Craig in abstract model theory.
 I.	The abstract setting}},
volume = {256},
year = {1979},
}

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