Gaya APA

Karagiannopoulos, G. et al (2005). Fathoming Porter’s five forces model in the internet era (VOL. 7 NO. 6 2005). United Kingdom: Emerald Group Publishing Limited.

Gaya MLA

Karagiannopoulos, G.D. et al. "Fathoming Porter’s five forces model in the internet era". VOL. 7 NO. 6 2005 United Kingdom: Emerald Group Publishing Limited, 2005. Article.