APA (7th ed.) Citation

Smit & den Hartogh. (1996). Trees and their shapes. Tiger Books.

Chicago Style (17th ed.) Citation

Smit and den Hartogh. Trees and Their Shapes. London: Tiger Books, 1996.

MLA (8th ed.) Citation

Smit and den Hartogh. Trees and Their Shapes. Tiger Books, 1996.

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