APA (7th ed.) Citation

Higgins, L. L. (1993). Route guidance information for elderly passengers: Route naming methods. [publisher not identified].

Chicago Style (17th ed.) Citation

Higgins, Laura Lynne. Route Guidance Information for Elderly Passengers: Route Naming Methods. [Place of publication not identified]: [publisher not identified], 1993.

MLA (9th ed.) Citation

Higgins, Laura Lynne. Route Guidance Information for Elderly Passengers: Route Naming Methods. [publisher not identified], 1993.