References: Procedures for the Collection of Diagnostic Blood Specimens by Venipuncture (H3-A6), 3rd Edition published by the National Committee for Clinical Laboratory Standards.
Palker TJ, Scearce RM, Hensley LL, Ho W, Haynes BF. Comparison of the CD7 (3A1) group of T cell workshop antibodies. In: Reinherz EL, Haynes BF, Nadler LM, Bernstein ID, eds. Leukocyte Typing II: Human T Lymphocytes. New York, NY: Springer-Verlag; 1986;1:303-313.