APA

(2019). THE GETTING THINGS DONE WORKBOOK. New York, New York: Penguin Books.

Chicago

2019. THE GETTING THINGS DONE WORKBOOK. New York, New York: Penguin Books.

Harvard

(2019). THE GETTING THINGS DONE WORKBOOK. New York, New York: Penguin Books.

MLA

THE GETTING THINGS DONE WORKBOOK. New York, New York: Penguin Books. 2019.