Whether metal oxides act as acids or bases is a foundational chemical property determined by their composition and bonding, making this common knowledge.
The claim states that the acidic or basic nature of oxides can be determined by their chemical properties. This is a fundamental, textbook chemical principle (e.g., nonmetal oxides tend to be acidic, metal oxides tend to be basic) and represents common chemical knowledge. Therefore, citation of specific retrieved literature is not required.