In summary, Hans C. Ohanian wrote a fine textbook titled Quantum Mechanics , not Principles of Quantum Mechanics . The confusion in search terms is a digital artifact, but it leads to a useful discussion about finding, respecting, and selecting the right quantum mechanics textbook for your level. Always prioritize legal access through your institution to support the authors and publishers who produce these indispensable resources.
Hans C. Ohanian's Principles of Quantum Mechanics is generally regarded as ohanian hans c. principles of quantum mechanics pdf