APA

Widginton D., Crossland D., Electrical Research Association E., Crossland D. & Electrical Research Association E. (1969). Intrinsic safety of circuits. Surrey: Electrical Research Association.

Chicago

Widginton D.W, Crossland D, Electrical Research Association ERA, Crossland D and Electrical Research Association ERA. 1969. Intrinsic safety of circuits. Surrey: Electrical Research Association.

Harvard

Widginton D., Crossland D., Electrical Research Association E., Crossland D. and Electrical Research Association E. (1969). Intrinsic safety of circuits. Surrey: Electrical Research Association.

MLA

Widginton D.W, Crossland D, Electrical Research Association ERA, Crossland D and Electrical Research Association ERA. Intrinsic safety of circuits. Surrey: Electrical Research Association. 1969.