I know you want a book about Methodology of Scientific Research (written in a easy and clear language). For what? Your own use or maybe to teaching!
Anyway, it seems to me that you cannot find any text with a universal and unchangeable Scientific Method, because it does not exist (from a historical, philosophical, and even scientific point of view)
(see https://www.youtube.com/watch?v=MZ2AjYYHfrw and https://www.youtube.com/watch?v=j12BBcKSgEQ ).
Moreover all the available proposals contains 'hypotheses' which may remain valid (according to Popper) until be falsified. In other words, by making the scientific research merely a 'serial killer of hypotheses'. Besides the creation of an hypothesis is based on heuristic tricks of imagination and their acceptance often requires non-rational attributes (such as Occam's razor, aesthetics, simplicity, etc.). In my opinion, HYPOTHESES ARE THE ACHILLES' HEEL OF SCIENCE.
Believe it or not, I am developing my researches with no appeal to hypotheses (except one methodological: plausible correspondence between theory and observations). Curious about?