All 4 of these books have the same subject - eating disorders - represented by the first two parts of the call number - RC552.A5. Next, we see letter-number combos that represent that authors' last names - R38 for Raviv, B76 for Brown, D87 for Dunkle, and A66 for Apostolides.
A for Apostolides would come before B, D, or R. Thus, RC552.A5 A66 1998 would be the first call number on this shelf.