Books on Google Play

google_logo Play

Sign in with Google
Library & devices
Payments & subscriptions
My Play activity
Offers
Play Pass
Settings

Privacy Policy • Terms of Service

More by Donald T. Campbell

Icon image Unobtrusive Measures

Unobtrusive Measures

Google Play

Play Pass

Play Points

Gift cards

Redeem

Refund policy

Kids & family

Parent Guide

Family sharing

Terms of Service

Privacy

About Google Play

Developers

Google Store

United States (English)