APA (7e ed.) Bronvermelding

(1980). Contruction Principles, Materials And Methods/ Harold B. Olin, John L. Schmidt And Walter H. Lewis. The institute of financial education.

Chicago (17e ed.) Bronvermelding

Contruction Principles, Materials And Methods/ Harold B. Olin, John L. Schmidt And Walter H. Lewis. The institute of financial education, 1980.

MLA (8e ed.) Bronvermelding

Contruction Principles, Materials And Methods/ Harold B. Olin, John L. Schmidt And Walter H. Lewis. The institute of financial education, 1980.