ANDERSON, Rane. 180 days of geography for first grade. Huntington Beach, California : Shell Education, [2018]. ©2018. 1 online zdroj (208 zdroj). Practice-assess-diagnose. Available on Internet: <https://ebookcentral.proquest.com/lib/ujep-ebooks/reader.action?docID=5882212> ISBN 978-1-4258-5505-5.