Cite Them Right 11th edition - Harvard

Frank Nielsen and Frank Nielsen (2009) A Concise and Practical Introduction to Programming Algorithms in Java.

Chicago Manual of Style 17th edition (full note)

Frank Nielsen, and Frank Nielsen. A Concise and Practical Introduction to Programming Algorithms in Java.

American Psychological Association 7th edition

Frank Nielsen, & Frank Nielsen. (2009). A Concise and Practical Introduction to Programming Algorithms in Java.

Modern Language Association 9th edition

Frank Nielsen, and Frank Nielsen. A Concise and Practical Introduction to Programming Algorithms in Java. 2009.

ISO-690 (author-date, Deutsch)

FRANK NIELSEN and FRANK NIELSEN, 2009. A Concise and Practical Introduction to Programming Algorithms in Java

Warning: These citations may not always be 100% accurate.