Packages Access codes for Pearson's MyLab & Mastering products may not be included when purchasing or renting from companies other than Pearson; check with the seller before completing your purchase. Used or rental books If you rent or purchase a used book with an access code, the access code may have been redeemed previously and you may have to purchase a new access code. Access codes Access codes that are purchased from sellers other than Pearson carry a higher risk of being either the wrong ISBN or a previously redeemed code. Check with the seller prior to purchase. creates a balanced view of the family from both current and historical points of view. The authors tap a range of research disciplines to create a broadly defined portrait of how great shifts in such areas as the national economy, life expectancy, and education are transforming the American family.