Cita APA (7th ed.)

University of London. Chelsea College. Centre for Science Education. conservation Education Project & Kelly, P. (1975). People and resources. Evans Brothers.

Cita Chicago (17th ed.)

University of London. Chelsea College. Centre for Science Education. conservation Education Project i Peter Kelly. People and Resources. London: Evans Brothers, 1975.

Cita MLA (9th ed.)

University of London. Chelsea College. Centre for Science Education. conservation Education Project i Peter Kelly. People and Resources. Evans Brothers, 1975.