@online{
   timsrc,
   author = "Lethbridge, Julian",
   title = "Lecture: Introduction to English Grammar; 4. Lesson",
   publisher = "Universität Tübingen",
   year = "2003",
   month = "Nov",
   day = "12",
   url = "https://timms.uni-tuebingen.de:443/tp/UT_20031112_001_enggramaudio_0001",
   urldate = "2024-11-23"
}