Adding Custom Labels in AddressBook for iPhone: A Step-by-Step Guide

Understanding Core Address Book: The Key to Accessing Contacts on Both iOS 6 and iOS 7

Saving and Retrieving Images in the Address Book API Programmatically

Understanding ABPersonEmailProperty and Email Retrieval in iOS: A Guide to Filtering Facebook Contacts

Accessing and Working with Address Book Data in iOS: A Comprehensive Guide to Street Addresses from ABPeoplePickerNavigationController