APA

Siler (David L), . (1972). International Encylopaedia Of The Social Sciences.Vol.18. : .

Chicago

Siler (David L), . 1972. International Encylopaedia Of The Social Sciences.Vol.18. : .

Harvard

Siler (David L), . (1972). International Encylopaedia Of The Social Sciences.Vol.18. : .

MLA

Siler (David L), . International Encylopaedia Of The Social Sciences.Vol.18. : . 1972.