Which guide is often used for writing style in business documents?

The Chicago Manual of Style is widely recognized as a comprehensive resource for writing style, particularly in the context of business and academic documents. It provides detailed guidelines on grammar, punctuation, citation, and overall document formatting. This manual is particularly valued for its clarity and thoroughness, making it a reliable reference for professionals who aim to produce clear and professionally-polished documents.

In contrast, while the World Book Encyclopedia offers factual information, it is not a style guide and does not provide the specific writing and formatting rules needed for crafting business documents. The Elements of Mathematics is highly specialized and does not address writing style or conventions relevant to business communication, focusing instead on mathematical theory. Likewise, the Engineering Handbook is tailored to engineering principles and practices, lacking the broad application to writing style that the Chicago Manual provides. Therefore, the Chicago Manual of Style stands out as the appropriate choice for ensuring effective writing standards in business contexts.