APA (7 वां संस्करण) प्रशस्ति पत्र

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.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

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.

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