Cita APA (7a ed.)

Mansfield, E. (1981). Composition of R and D expenditures: Relationship to size of firm, concentration and innovative output. [s.n.].

Cita Chicago Style (17a ed.)

Mansfield, Edwin. Composition of R and D Expenditures: Relationship to Size of Firm, Concentration and Innovative Output. [S.l.]: [s.n.], 1981.

Cita MLA (9a ed.)

Mansfield, Edwin. Composition of R and D Expenditures: Relationship to Size of Firm, Concentration and Innovative Output. [s.n.], 1981.