Create CustomBaseEditor.cs

Custom base editor class. Inherited from Editor class.
Contains handy method to use.

UOP1_Project/Assets/Scripts/Editor/CustomBaseEditor.cs

+using UnityEditor;
+using UnityEngine;
+
+/// <summary>
+/// Custom base editor class. Inherited from Editor class.
+/// Contains handy method to use.
+/// </summary>
+public class CustomBaseEditor : Editor
+{
+	/// <summary>
+	/// Draw reference information about script being edited.
+	/// </summary>
+	/// <typeparam name="T">Inspected type.</typeparam>
+	public void DrawNonEdtiableScriptReference<T>() where T : Object
+	{
+		//Make GUI not editable.
+		GUI.enabled = false;
+
+		//Draw reference information about script being edited.
+		if (typeof(ScriptableObject).IsAssignableFrom(typeof(T)))
+			EditorGUILayout.ObjectField("Script", MonoScript.FromScriptableObject((ScriptableObject)target), typeof(T), false);
+		else if (typeof(MonoBehaviour).IsAssignableFrom(typeof(T)))
+			EditorGUILayout.ObjectField("Script", MonoScript.FromMonoBehaviour((MonoBehaviour)target), typeof(T), false);
+
+		//Make GUI editable. 
+		GUI.enabled = true;
+	}
+}

UOP1_Project/Assets/Scripts/Editor/CustomBaseEditor.cs.meta

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