Searching for "Rokeach 1973 Nature of Human Values PDF" will often yield academic citations, reviews, and sometimes authorized excerpts or related research studies.

“To say that a person ‘has a value’ is to say that he has an enduring belief that a specific mode of conduct or end-state of existence is personally and socially preferable.” (p. 7)

If you work in organizational behavior, marketing, political science, or psychology, this book is likely the bedrock upon which modern value surveys stand.