@book{28887,
	author = {Usama Khalid & S. M. Zeeshan Qadri},
	title = {IOT Based Intercom},
	publisher = {UIT,},
	year = {2015},
	address = {Karachi:},
	url = {https://drive.google.com/file/d/1YyDEoaXhxhOyPRUgyg7jLvOto41dJYFF/view?usp=sharing}
}