Roberts, P. Understanding English.
Cita Chicago Style (17a ed.)Roberts, Paul. Understanding English.
Cita MLA (9a ed.)Roberts, Paul. Understanding English.
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Cita APA (7a ed.)
Roberts, P. Understanding English.
Cita Chicago Style (17a ed.)Roberts, Paul. Understanding English.
Cita MLA (9a ed.)Roberts, Paul. Understanding English.