Cita APA (7a ed.)

Valdini, A., Steinhardt, S., & Feldman, E. (1989). Usefulness of a standard battery of laboratory tests in investigating chronic fatigue in adults. [s.n.].

Cita Chicago Style (17a ed.)

Valdini, Anthony, Susan Steinhardt, y Edward Feldman. Usefulness of a Standard Battery of Laboratory Tests in Investigating Chronic Fatigue in Adults. [S.l.]: [s.n.], 1989.

Cita MLA (9a ed.)

Valdini, Anthony, et al. Usefulness of a Standard Battery of Laboratory Tests in Investigating Chronic Fatigue in Adults. [s.n.], 1989.