American Society for Testing and Materials.1976 annual book of ASTM standards．v.37，rubber, natural and synthetic-general test methods：carbon black.ATSM,1976.
.General Test Guide 2015 : study & prepare pass your test and know what is essential to become a safe, competent AMT - from the most trusted source in aviation training..Aviation Supplies & Academics, Inc.,,2015..
General Test Guide 2015 : study & prepare pass your test and know what is essential to become a safe, competent AMT - from the most trusted source in aviation training.
