The question is slightly confusing. If you mean on references about AHP or ANP, there is a lot of papers by Thomas Saaty (cofounder of the method). Can you describe the specifics of the references you are looking for?
You may give this type of reference as: "as cited by XYZ (2000) weights are assigned to decision ............ (ABC 1999)" Where ABC is the prior study which was quoted by XYZ in his recent work.