Dunn, V., & Gruber, D. Listening. Intermediate.
芝加哥风格引文Dunn, Viviane, 与 Diann Gruber. Listening. Intermediate.
MLA引文Dunn, Viviane, 与 Diann Gruber. Listening. Intermediate.
警告：这些引文格式不一定是100％准确.
APA引文
Dunn, V., & Gruber, D. Listening. Intermediate.
芝加哥风格引文Dunn, Viviane, 与 Diann Gruber. Listening. Intermediate.
MLA引文Dunn, Viviane, 与 Diann Gruber. Listening. Intermediate.