APA
Hillier Parker Research, . (1991). Central London shops survey . - No. 5 (March 1991). London: Hillier Parker May and Rowden.
Chicago
Hillier Parker Research, . 1991. Central London shops survey . - No. 5 (March 1991). London: Hillier Parker May and Rowden.
Harvard
Hillier Parker Research, . (1991). Central London shops survey . - No. 5 (March 1991). London: Hillier Parker May and Rowden.
MLA
Hillier Parker Research, . Central London shops survey . - No. 5 (March 1991). London: Hillier Parker May and Rowden. 1991.