APA
(1971). Code of practice for design and construction of septic tanks2Pts. Pt. 1. Small installations. Pt. 2. Large installations. : .
Chicago
1971. Code of practice for design and construction of septic tanks2Pts. Pt. 1. Small installations. Pt. 2. Large installations. : .
Harvard
(1971). Code of practice for design and construction of septic tanks2Pts. Pt. 1. Small installations. Pt. 2. Large installations. : .
MLA
Code of practice for design and construction of septic tanks2Pts. Pt. 1. Small installations. Pt. 2. Large installations. : . 1971.