ベッツィーとテイシイ
Rechner, Amy Dolnick. Between Deep Valley and the Great World: Maud Hart Lovelace in Minneapolis. Middlethird Books. 2012年. ISBN 978-0985386207.
Schrader, Julie A. Maud Hart Lovelace's Deep Valley: A Guidebook of Mankato Places in the Betsy-Tacy Series. Minnesota Heritage Publishing. 2002年. ISBN 978-0971316829.
Whalen, Sharla Scannell. The Betsy-Tacy Companion: A Biography of Maud Hart Lovelace. Portarlington Press. 1995年. ISBN 978-0963078308.