Paper  bibtex   

@article{john_pirc_common_nodate,
	title = {Common {Network} {Security} {Misconceptions}: {Firewalls} {Exposed}},
	url = {https://www.sans.edu/cyber-research/security-laboratory/article/pirc-john-firewalls},
	journal = {SANS Technology Institute},
	author = {{John Pirc}},
}