MLA

Schirmer, Werner, and Dimitris Michailakis. Systems Theory for Social Work and the Helping Professions. London: Routledge, 2019.

APA

Schirmer, W., & Michailakis, D. (2019). Systems theory for social work and the helping professions. London: Routledge.

Chicago

Schirmer, Werner, and Dimitris Michailakis. Systems Theory for Social Work and the Helping Professions. London: Routledge, 2019.