Gaya APA

Guinness, O. (2018). Last Call for Liberty : How America's Genius for freedom has become its greatest threat . Downers Grove, Illinois, USA: InterVarsity Press.

Gaya MLA

Guinness, Os. "Last Call for Liberty : How America's Genius for freedom has become its greatest threat". Downers Grove, Illinois, USA: InterVarsity Press, 2018. Academic.