APA

(2018). On the Bright Side: The New Secret Diary of Hendrik Groen, 85 Years Old. لندن: دار Michael Joseph – Penguin Books ،.

Chicago

2018. On the Bright Side: The New Secret Diary of Hendrik Groen, 85 Years Old. لندن: دار Michael Joseph – Penguin Books ،.

Harvard

(2018). On the Bright Side: The New Secret Diary of Hendrik Groen, 85 Years Old. لندن: دار Michael Joseph – Penguin Books ،.

MLA

On the Bright Side: The New Secret Diary of Hendrik Groen, 85 Years Old. لندن: دار Michael Joseph – Penguin Books ،. 2018.