Cita APA (7a ed.)

(1997). The National Plant Collections directory (Edición 1997.). National Council for the Conservation of Plants & Gardens.

Cita Chicago Style (17a ed.)

The National Plant Collections Directory. Edición 1997. London: National Council for the Conservation of Plants & Gardens, 1997.

Cita MLA (9a ed.)

The National Plant Collections Directory. Edición 1997. National Council for the Conservation of Plants & Gardens, 1997.