Cita APA (7a ed.)

Ross, J. R. (1969). Auxiliaries as main verbs. [s.n.].

Cita Chicago Style (17a ed.)

Ross, John Robert. Auxiliaries as Main Verbs. [S.l.]: [s.n.], 1969.

Cita MLA (9a ed.)

Ross, John Robert. Auxiliaries as Main Verbs. [s.n.], 1969.