Smart, MW (1974). "Labour market areas: uses and definition". Progress in Planning. 2: 239–353. doi:10.1016/0305-9006(74)90008-7.
Halas, M; Klapka, P; Tonev, P; Bednar, M (2015). "An alternative definition and use for the constraint function for rule-based methods of functional regionalisation". Environment and Planning A. 47 (5): 1175–1191. Bibcode:2015EnPlA..47.1175H. doi:10.1177/0308518X15592306. S2CID143263476.
Halas, M; Klapka, P; Tonev, P; Bednar, M (2015). "An alternative definition and use for the constraint function for rule-based methods of functional regionalisation". Environment and Planning A. 47 (5): 1175–1191. Bibcode:2015EnPlA..47.1175H. doi:10.1177/0308518X15592306. S2CID143263476.
Halas, M; Klapka, P; Tonev, P; Bednar, M (2015). "An alternative definition and use for the constraint function for rule-based methods of functional regionalisation". Environment and Planning A. 47 (5): 1175–1191. Bibcode:2015EnPlA..47.1175H. doi:10.1177/0308518X15592306. S2CID143263476.