Cita APA (7a ed.)

Janson, M., & Opitz, H. (2015). World guide to special libraries 2015 (10th ed.). De Gruyter Saur.

Cita Chicago Style (17a ed.)

Janson, Marlies, y Helmut Opitz. World Guide to Special Libraries 2015. 10th ed. [Berlin]: De Gruyter Saur, 2015.

Cita MLA (9a ed.)

Janson, Marlies, y Helmut Opitz. World Guide to Special Libraries 2015. 10th ed. De Gruyter Saur, 2015.