Start with high-confidence nursing assessment books, then narrow by subgenre or adjacent topics.
Fast Facts for the Triage Nurse
Lynn Sayre Visser, Anna Sivo Montejano
Telephone Triage Protocols for Nurses
Julie K Briggs
Nurses' Handbook of Health Assessment
Janet R Weber
Bates' Guide to Physical Examination and History Taking
Lynn S. Bickley, Peter G. Szilagyi