1.
Calvin Coolidge, 30th President of the United States. Ada: Garrett Educational Corporation; 1990.
Calvin Coolidge, 30th President of the United States. Ada : Garrett Educational Corporation, 3 juin 1990. ISBN 0944483577
Stevens Rita. (1990). Calvin Coolidge, 30th President of the United States. Garrett Educational Corporation.
Style de citation MLA (8e éd.)Stevens Rita. Calvin Coolidge, 30th President of the United States. Garrett Educational Corporation, 1990.
Attention : ces citations peuvent ne pas être correctes à 100%.