Cita APA (7th ed.)

Unknown. (2023). The naturalists’ directory. Samuel E. Cassino, U.S.A.

Cita Chicago (17th ed.)

Unknown. The Naturalists’ Directory. Samuel E. Cassino, U.S.A, 2023.

Cita MLA (9th ed.)

Unknown. The Naturalists’ Directory. Samuel E. Cassino, U.S.A, 2023.