References sources are a great place to start research. They also help you to define or better understand a concept. Reference sources are not meant to be read cover-to-cover. They are meant to be consulted to answer a question or gain insight about a particular question you have.
The following are some of the reference sources we have in our collection that relate to physics.
McGraw-Hill Concise Encyclopedia of Physics
CRC handbook of chemistry and physics by 
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