Cita APA (7a ed.)

Johannisson, B., & Lindström, C. (1971). Firm size and inventive activity. [s.n.].

Cita Chicago Style (17a ed.)

Johannisson, Bengt, y Christian Lindström. Firm Size and Inventive Activity. [S.l.]: [s.n.], 1971.

Cita MLA (9a ed.)

Johannisson, Bengt, y Christian Lindström. Firm Size and Inventive Activity. [s.n.], 1971.