Puchta, H., & Gerngross, G. Playway to english: Teacher's guide 3.
芝加哥风格引文Puchta, Herbert, 与 Günter Gerngross. Playway to English: Teacher's Guide 3.
MLA引文Puchta, Herbert, 与 Günter Gerngross. Playway to English: Teacher's Guide 3.
警告：这些引文格式不一定是100％准确.