letter of reference的用法和樣例：
例句
用作名詞 (n.)
- She balled the letter into a wad.
她將信揉成一團。 - We have had no acknowledgement of our letter.
我們沒有收到過確認去信已收到的迴音。 - Each recommendation must include the completed Reference Form as well as a separate letter from your recommender written and signed on academic or business letterhead stationery.
要什麼樣的信頭，是申請學校的還是推薦人所在學校，還是其它的？
