Cita APA (7a ed.)

Hammer, P. R., Hobhouse, P., & Moss Warner, K. (1991). The New Topiary: Imaginative techniques from Longwood Gardens. Garden Art Press.

Cita Chicago Style (17a ed.)

Hammer, Patricia Riley, Penelope Hobhouse, y Katy Moss Warner. The New Topiary: Imaginative Techniques from Longwood Gardens. Woodbridge: Garden Art Press, 1991.

Cita MLA (9a ed.)

Hammer, Patricia Riley, et al. The New Topiary: Imaginative Techniques from Longwood Gardens. Garden Art Press, 1991.