Παραπομπή APA

Dewey M. (1971). Decimal Classification and relative Index (18.). Lake Placid Club.

Παραπομπή Chicago Style

Dewey M. Decimal Classification and Relative Index. 18. London: Lake Placid Club, 1971.

Παραπομπή MLA

Dewey M. Decimal Classification and Relative Index. 18. Lake Placid Club, 1971.