Peer teaching and learning are learner-centred approaches with great potential for promoting effective learning, and the fast development of Web 2.0 technology has opened new doors for promoting peer teaching and learning. In this study, we aim to establish peer teaching and learning among students by employing a Wikibook project in the course "Introduction to Linguistics" in the Hong Kong Institute of Education. Students were asked to work in groups to write an academic book online, and the Wikibook technology allows students to peer-edit and peer-comment on each other's academic works online. Peer teaching sessions were arranged as well based on the content of the Wikibook. To determine students' perceptions on peer teaching and learning occurring in the course, two surveys and follow-up interviews were conducted. The findings suggest that the Wikibook project is an effective way to promote peer teaching and learning in higher education.