APA

Kássler P., Seidl R., Sickler R., Shell, World Petroleum Congress (11th. : 1983 : London), Seidl R., Sickler R. & Shell.Capital requirements of the oil industry until 2000. : .

Chicago

Kássler P, Seidl R.G, Sickler R.A, Shell, World Petroleum Congress (11th. : 1983 : London), Seidl R.G, Sickler R.A and Shell.Capital requirements of the oil industry until 2000. : .

Harvard

Kássler P., Seidl R., Sickler R., Shell, World Petroleum Congress (11th. : 1983 : London), Seidl R., Sickler R. and Shell.Capital requirements of the oil industry until 2000. : .

MLA

Kássler P, Seidl R.G, Sickler R.A, Shell, World Petroleum Congress (11th. : 1983 : London), Seidl R.G, Sickler R.A and Shell.: . .