APA Edition Citation

Houghton B. (1971). Decimal Classification and relative Index (18.). Lake Placid Club.

Chicago Edition Citation

Houghton B. Decimal Classification and Relative Index. 18. London: Lake Placid Club, 1971.

MLA Edition Citation

Houghton B. Decimal Classification and Relative Index. 18. Lake Placid Club, 1971.

Warning: These citations may not always be 100% accurate.