I'm assuming you are referring to the book "Chemical Calculations: The Hartree-Fock Method with the Chemical Bond as a Guiding Concept" by H. Benson Harris (also known as Harold Benson) but likely you are referring to Frank Benson or more likely still, possibly Hugh C. Benson or possibly just plain Benson in some document not easily referenced.
But I think I actually found..
The second "edition or so" By Frank Benson and possibly other authors titled calculos quimicos benson pdf
A widely used reference on chemical calculations is: I'm assuming you are referring to the book
You are actually likely referring to "Chemical Calculations" by Frank C. Benson calculos quimicos benson pdf