@online{ timsrc, author = "Lethbridge, Julian", title = "Lecture: Introduction to English Grammar; 5. Lesson", publisher = "Universität Tübingen", year = "2003", month = "Nov", day = "19", url = "https://timms.uni-tuebingen.de:443/tp/UT_20031119_001_enggramaudio_0001", urldate = "2024-11-27" }