Citazione Stile APA (7a Edizione)

Seferian, H., & Whitcomb, C. (2004). Hardscaping: High style,low maintenance outdoor spaces. McGraw-Hill Professional.

Citazione stile Chigago Style (17a edizione)

Seferian, Haig, e Claire Whitcomb. Hardscaping: High Style,low Maintenance Outdoor Spaces. New York, N.Y: McGraw-Hill Professional, 2004.

Citatione MLA (9a ed.)

Seferian, Haig, e Claire Whitcomb. Hardscaping: High Style,low Maintenance Outdoor Spaces. McGraw-Hill Professional, 2004.