Can your readers distinguish which content is yours and which belongs to sources you are citing?
To help the reader make those distinctions, introduce your sources. For example: In the Library Chronicles, George Norlin claims ....
Try some of these verbs to help introduce your sources.
acknowledges | adds | admits | agrees | argues | asserts | believes | claims | comments | compares | confirms | contends | declares | demonstrates |denies | describes | disputes | emphasizes | endorses | explains | grants | illustrates | indicates | implies | insisted | narrates | notes | observes | offers outlines | reasons | refutes | rejects | reports | responds | says | shows | suggested | writes