Cita APA (7a ed.)

Wellman, G. (1998). The Heinemann ELT english wordbuilder. Heinemann.

Cita Chicago Style (17a ed.)

Wellman, Guy. The Heinemann ELT English Wordbuilder. Oxford [etc.]: Heinemann, 1998.

Cita MLA (9a ed.)

Wellman, Guy. The Heinemann ELT English Wordbuilder. Heinemann, 1998.