Boothroyd, J. (2011). Loud or soft? high or low?: A look at sound.
Cita Chicago Style (17a ed.)Boothroyd, Jennifer. Loud or Soft? High or Low?: A Look at Sound. 2011.
Cita MLA (8a ed.)Boothroyd, Jennifer. Loud or Soft? High or Low?: A Look at Sound. 2011.
Precaución: Estas citas no son 100% exactas.