Motion occurs in multiple dimensions with different reference frames. Velocity must be measured relative to a specific reference frame. Earth is commonly used as reference frame for most motion examples
Parenthetical referencing uses parentheses for in-text citations. Two main styles exist: author-date (Harvard) and author-title (MLA). Harvard style is used in sciences and social sciences. MLA style is preferred in arts and humanities
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Vancouver system uses numbers in text to reference numbered reference list entries. One of two main medical referencing systems alongside author-date system. Used by MEDLINE and PubMed, with hundreds of scientific journals adopting it. System has existed for over a century, named since 1978