3G Elearning FZ LLC. (2016). Landscape installation and maintenance (softscape): Intermediate. 3G Elearning.
Chicago-referens (17:e uppl.)3G Elearning FZ LLC. Landscape Installation and Maintenance (softscape): Intermediate. UAE: 3G Elearning, 2016.
MLA-referens (9:e uppl.)3G Elearning FZ LLC. Landscape Installation and Maintenance (softscape): Intermediate. 3G Elearning, 2016.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.