APA

Drilling and Completion Committee, Petroleum Industry Training Sevice (PITS) & Petroleum Industry Training Sevice (PITS). (2002). Ground disturbance in the vicinity of buried facilities (last updated march 28, 2003). Calgary, Alberta: Petroleum Industry Training Service (PITS).

Chicago

Drilling and Completion Committee, Petroleum Industry Training Sevice (PITS) and Petroleum Industry Training Sevice (PITS). 2002. Ground disturbance in the vicinity of buried facilities (last updated march 28, 2003). Calgary, Alberta: Petroleum Industry Training Service (PITS).

Harvard

Drilling and Completion Committee, Petroleum Industry Training Sevice (PITS) and Petroleum Industry Training Sevice (PITS). (2002). Ground disturbance in the vicinity of buried facilities (last updated march 28, 2003). Calgary, Alberta: Petroleum Industry Training Service (PITS).

MLA

Drilling and Completion Committee, Petroleum Industry Training Sevice (PITS) and Petroleum Industry Training Sevice (PITS). Ground disturbance in the vicinity of buried facilities (last updated march 28, 2003). Calgary, Alberta: Petroleum Industry Training Service (PITS). 2002.