APA
Usher R., Bryant I., . (1989). Adult education as theory, practice and research. London: Routledge.
Chicago
Usher Robin, Bryant Ian, . 1989. Adult education as theory, practice and research. London: Routledge.
Harvard
Usher R., Bryant I., . (1989). Adult education as theory, practice and research. London: Routledge.
MLA
Usher Robin, Bryant Ian, . Adult education as theory, practice and research. London: Routledge. 1989.