Cita APA (7a ed.)

Treble, H., & Vallins, G. An A.B.C. of English Usage.

Cita Chicago Style (17a ed.)

Treble, H.A, y G.H Vallins. An A.B.C. of English Usage.

Cita MLA (9a ed.)

Treble, H.A, y G.H Vallins. An A.B.C. of English Usage.