Gaya APA

Heussenstamm, P., PENGARANG, . (2015). Happiness Colour Youself Calm (Cet 1). Jerman: Quadrille Publishing.

Gaya MLA

Heussenstamm, Paul., PENGARANG, . "Happiness Colour Youself Calm". Cet 1 Jerman: Quadrille Publishing, 2015. Text.