The fact that the Yale Romanization system defines specific rules for transcribing Korean is a matter of common knowledge regarding standard linguistic romanization schemes, requiring no citation.
The claim states that a well-known romanization system (Yale) has specific rules for transcribing a language (Korean). This is trivially true by definition, as any established romanization system inherently consists of a specific set of transcription rules. Following STEP 0, this is classified as COMMON_KNOWLEDGE, and none of the provided retrieved papers (which discuss sentence production, phonological acquisition, aging, and character recognition) are cited as evidence.