You can "borrow" digital copies of the second and third editions through the Internet Archive's Open Library.
While reliability is necessary, Nunnally emphasizes that it is not sufficient for a good test. A test can be perfectly reliable (consistent) but entirely wrong. This leads to the discussion of Validity. psychometric theory nunnally pdf
The Psychometric Theory Nunnally PDF provides: You can "borrow" digital copies of the second
The text moves into the geometry of tests, introducing as the primary tool for understanding the structure of psychological constructs. Ira Bernstein) Psychometric Theory - Scribd
Psychometric Theory Jum C. Nunnally (and later Ira H. Bernstein
Nunnally and Bernstein outline a rigorous process for creating self-reporting measurement instruments: (Jum Nunnally, Ira Bernstein) Psychometric Theory - Scribd