: The first place to look is often the publisher's website. Many textbook publishers offer supplementary materials, including solutions manuals, for their textbooks. You might need a faculty account to access these resources.
If you're working on a specific problem right now, let me know the chapter and problem number quantum physics stephen gasiorowicz solutions manual best
Physics is a "contact sport"—you learn by doing. The best way to use a manual for Gasiorowicz is as a . Attempt the derivation for at least 20 minutes before looking. If you get stuck on the math, use the manual to find the specific integral or substitution you missed, then close it and finish the problem yourself. : The first place to look is often the publisher's website
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