Letter, To: "Precious Daughter" From: "Father," [n.d.].
Chicago Style (17th ed.) CitationLetter, To: "Precious Daughter" From: "Father," [n.d.].
MLA引文Letter, To: "Precious Daughter" From: "Father," [n.d.].
警告：这些引文格式不一定是100％准确.
APA引文