Cita APA (7th ed.)

YAM, P. (2012). PRIMARY LEVEL COMPLETE VOCABULARY (1st.). SAP GROUP.

Cita Chicago (17th ed.)

YAM, PETER. PRIMARY LEVEL COMPLETE VOCABULARY. 1st. SINGAPORE: SAP GROUP, 2012.

Cita MLA (9th ed.)

YAM, PETER. PRIMARY LEVEL COMPLETE VOCABULARY. 1st. SAP GROUP, 2012.