Since I cannot directly provide a copyrighted PDF file, I can offer a comprehensive review of the book "What is Sociolinguistics?" by Gerard Van Herk (2018, Wiley-Blackwell).
Region and Dialect: How geography shapes our sounds (e.g., rhyming "shone" with "gone" vs. "bone"). what is sociolinguistics gerard van herk pdf
Van Herk provides a practical guide to gathering data: recording conversations, designing sociolinguistic interviews, and analyzing variables using statistical tools. Since I cannot directly provide a copyrighted PDF
Style and Interaction: How speakers structure conversations and use language to present themselves to others. How to design a survey