I think it depends on what kinda book you want to buy cuz they are real different. Technical Manual is a all-round book from quality, genetic, donor, component preparation, blood group, transfusion practice, etc ........ however, I personally like the last edition better. Judd's Immunohematology is mainly procedures like an SOP which is good for a reference lab. Antigen Factbooks and Human Blood Group are very informative in blood grouping. So ask yourself what kinda book do you want before you buy. Hope that helps. CK Cheng, MSc, SBB(ASCP), CQA(ASQ)