Παραπομπή σε μορφή APA (7η εκδ.)

Hopper, L. J. (2005). Security and Site Designa Landscape Architectural Approach to Analysis, assessment, and design implementationLeonard J. Hopper and Martha J. Droge. John Wiley & Sons.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hopper, Leonard J. Security and Site Designa Landscape Architectural Approach to Analysis, Assessment, and Design ImplementationLeonard J. Hopper and Martha J. Droge. John Wiley & Sons, 2005.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hopper, Leonard J. Security and Site Designa Landscape Architectural Approach to Analysis, Assessment, and Design ImplementationLeonard J. Hopper and Martha J. Droge. John Wiley & Sons, 2005.