These sources are listed in citation format and follow an established style, such as MLA (Modern Language Association), APA (American Psychological Association) or Chicago Manual of Style.

• 这些来源以一定的引用格式和下列已建好的风格被列出，如MLA（现代语言联合会），APA（美国心理联合会）或芝加哥时尚指南。